Hi OP,
I’ll be honest I think the whole “there is no right time” thing is a bit naive. Of course there is a right time and there are times that are a lot, lot better than others.
Obviously people have children in all sorts of circumstances but why make it a struggle? I don’t mean to be unkind but I think the fact you have to ask if having a baby as a student is the wrong time shows you haven’t really considered the reality of this. I totally understand the feeling of baby fever (I’ve had it myself!) but the reality is it’s really hard work and your circumstances could be a lot better than they are now.
Have you thought about how you will afford to feed, clothe and house yourselves and a baby? How will you pay your bills? Will you be able to afford child care? Will you have any money left over to actually spend on enjoying yourselves? If you literally live hand to mouth every month, it probably won’t be much fun. Money worries are stressful anyway without adding a newborn to the mix.
You say you’re willing to settle for any job but why not aim higher and get a good graduate job in the field you’re qualified in? You say your husband wants to teach, which is great, as science is a shortage subject so he probably stands quite a good chance. Your NQT year is hard though, I couldn’t imagine doing it with a young baby. It just seems like unnecessary stress on you both.
I know waiting a few years seems like ages away but I’d honestly wait until you’ve both graduated, are in stable employment with a decent place to live and can afford to take care of yourselves and a child. Also, have you thought about child care? If you decide to conceive now then who looks after the baby when you both need to be in lectures or writing and researching projects or whatever? What if you have a difficult pregnancy and end up with HG or something, so can’t attend a lot of your lectures or complete a lot of university work before you give birth? Would you be able to defer your course? Is there any guarantee that if you did defer, you’d be able to pick it up again with a newborn?
I also totally understand your fear of infertility. I knew I was going to struggle to conceive, I’d know that since I was 18, but I still wanted to wait until we were settled in good jobs and would be able to support ourselves and a baby financially. There is no reason that just because your family members have had infertility, you will. Try not to let that fear push you into making a rash decision.
I know it all seems so wonderful when you start thinking about having a baby and of course it is wonderful but I think you need to really, really think about this.
Good luck OP. I hope this hasn’t come across as unkind. I really hope everything works out for you.