First of all I am sorry you are going through this thanks
I will try and explain as much of the adotion process as I can and answer your questions - please forgive me the length as well
Can I ask, is anyone supporting you? Do you have friends around you, or anyone to be a listening ear, a hand hold? You deserve lots of support at such a difficult time. If you don't or you want more, can your GP or anyone point you in the direction of extra support, or a counsellor? There is an adoption organisation called After Adoption who can support and talk to birth parents, they might be worth calling.
Adoption has a certain process and rules, which has to be followed, and I don't know how much the SW has discussed with you, so also please forgive me if I repeat what you've already been told
The first thing is that within the whole family court and care system, it is a guiding principle (though much more complex in reality) that children who can't live with their mothers (or whose mother choose to have them adopted) are best served by remaining with their extended birth family. Adoption is down the list as the next best option if there is no family option. That's why the social worker is asking you if anyone in your family would be able to care for your baby, because social services are supposed to look at family first. No one can or will make you personally parent your baby though, and if after birth you still don't prefer to do that, everyone should respect that.
In the UK, only the state, via local authorities, can take children in care (including voluntary care). Voluntary/independent agencies like Barnados, can recruit and approve adoptive parent, but they don't actually have children in their custody, their adopters adopt children from local authorities. Because of this, you can't go through an independent agency, only a local authority/council.
Once your baby is born, you don't have to take them home. It's up to you how much time you spend with your baby, and it's something you can put in a birth plan, so the midwives at the hospital understand what's happening. Talk to your midwife about what you would like to happen after birth, and getting it written down if you want. You can still change your mind later on about what you want to do
Once your baby is ready to be discharged, a social worker will take baby to a foster home. The law in the UK is that a child can only be placed with adoptive parents with either signed consent forms from the birth parent/s, or a legal order which is used when birth parents don't agree with adoption. The law also says that consent forms to adoption can never be signed before a baby is 6 weeks old. That's why your social worker is talking about 6 weeks. Your baby has to be placed with someone approved to foster until you have given social services legal authority to place them with an adoptive only family.
You are free to change your mind for a while after your baby is born. Even after you sign consent forms, which has to be after 6 weeks. The consent forms aren't irrevoacable. Quite often, people do feel very differently after birth, though of course some people feel the same.
After the forms are signed, the sw's will look for an adoptive family. I can say for certain that there are many many families approved to adopt young children, and if your baby is healthy they will definitely be found a home. You can express a preference for a certain kind of family, especially about religion and family structure. No one can guaruntee that a family will be found who are 'perfect' but if your preferences are common in adoptive families (eg. a two parent christian or non-religious family) it's very likely a family will be be found who match what you want.
The time to move a baby from foster home to adoptive home does take some time, because there is a process the adopters go through that always takes weeks, usually at least 8 weeks. It's possible your baby could be placed with adopters as early as 3/4 months, but it may well also take a few months longer.
Even after placement, you have time to change your mind - until the parent/s files papers with the court, which they can't do for at least 10 weeks
I would say that adoption is such a final and permanent thing that it's not something to go into with doubts. If you find yourself doubting after the birth, then pause the process and don't sign forms just yet.
An adoption won't be legally complete for quite a while - I would say 5 or 6 months absolute minimum after placement with adoptive parents. You don't have to be legally involved after signing forms if you don't want to be.
I hope that is helpful x