whoopsy baby :/

I have a beautiful daughter who is 10 months old. And I'm worried I am pregnant. We weren't trying and I am on the pill. I have very irregular periods with it and had vomiting and it coming out the other end a few weeks 😷 (probably couple of months ago now). I know people will say take a test (I'm going to do it tomorrow when I get a chance to buy one). But I just wanted to know how people coped with this. I have worked out that if I am, there will be exactly 18 months between babies. My problem is my husband really doesn't want another baby and I am sh*t scared as I suffered with PND with my daughter, something I have only just been able to kick it's butt. So yeah basically o just want to know what people did to cope etc with age gap that small and with a whoopsy baby when your not really sure it is something you wanted :/ I'm sorry if this upsets people as I know many people try damn hard for a baby and here I am in this situation...