I won't tell you what to do, but I'll just let you know of my very recent experience.

I'm currently pregnant with a VERY surprise baby. My youngest is only 7 1/2 months and both her and my 2 year old son are both still breastfeeding. I haven't had an AF since having my DD. Also, in the entire month, my husband and I only ever DTD once due to illness after illness in our house. Basically, this baby is as close as you get to divine conception, lol.

I guess my point is, even when the odds of falling pregnant are really really low, it can definitely still happen.

My DH was very against having any more children because we already have 2 together, and we also have his two older sons from a previous relationship that also live with us. Even though he is still quite shocked and still trying to convince himself that things are going to be ok, he has never once blamed me for falling pregnant. If it turns out you fall pregnant, I hope you partner is the same. Hugs to you.