OP, ignore the people giving you a hard time about nursery at 3 months. People are picking up on the wrong aspect of your question IMO, as what you do with a 3 month old is actually kind of irrelevant.
Yes, you can to an extent ‘outsource’ the day to day care of a child up until they are about 4 with a nursery or nanny. But unless you are enormously loaded and can afford both a day time live in nanny and night nanny, you are still going to have to do significant parenting overnight and on weekends. Even if you don’t breastfed, the broken sleep can go on for YEARS. And what you can’t really escape/outsource, is the restriction on your lifestyle and freedoms. And that restriction is not limited to the baby stage, it exists at least until they leave home! Once you have a child your time is never your own to do with as you please anymore.
If you want to seriously consider having a child, I think you need to almost ignore the baby stage for now and think about how you will really feel about the longer term view. I really really wanted children, but I found adjusting to the lack of freedom & the responsibility of child rearing, very very difficult. And I really wanted to be a parent!
I also agree with others that you need to sit down with your DH and have a very frank conversation about exactly how much he would be willing to do. Will he do all the all over nights for years on end if you have a crap sleeper? Will he really, truly, take days off week after week after week when your child keeps getting sick (quite common when children start group childcare, or school if the child has been at home up until then). If your child has additional needs, will he put his career on the back burner (or stop completely) to handle specialist appointments, physio, etc? Will he carry the mental load of tracking the child’s development, arranging childcare, school applications, play dates, home work, inset days, school holiday cover (3-4 months of the year depending on if you do state or private school!), medical appointments, etc? Or will he expect you to be the project manager for all this and he just executes?
And how’s your sex life? How important is it to you both, truly? Do either of you have a high sex drive? Would you really be ok with little to no sex for a couple of years? As this is the reality for many new parents, especially if you are lucky enough to end up with birth injuries or c-section complications that drag on (again, more common than people realise, it’s just not spoken about). Even without any physical issues, the sleep deprivation and sheer exhaustion of parenting puts a dampener on sex for most people.
I could go on and on but I guess I’m echoing a few precious posters that say, a child is profoundly lifechanging and not something that can be project managed. Your life will not be as it is now just with a baby. It will be a totally different life, with many new restrictions. And you won’t know exactly what kind of life you will get until after the baby is here, and then it’s too late.
If you like your life as it is now, please don’t feel pressured to have a child (by your husband, by society, by anyone!). It’s totally ok to say no. It’s 2018, not 1950. Women are allowed now to choose.
Of course there are many positives to having kids too - my DC are the best things to ever happen to me and they bring me so much joy and pride it’s indescribable. But people always talk about that part.... no one is honest (in real life) about the many many shit parts of parenting!