Really want another!

I'll try to keep this short(ish)

I have 2 kids, one is 6 and the other is 13months. After the birth of my second my partner and i decided we didn't want any more so I got on the waiting list to get my tubes tied. When he was 9 months old I discovered I was pregnant again but had to have a medically advised termination. Since then all I can think about is having another baby. My heart aches for another. My partner on the other hand is dead against the idea and the reasons I had to terminate would still be an issue if I fell pregnant again. I'm really torn between knowing I shouldn't fall pregnant again and this deep seeded urge to fall pregnant again.

So what would you do in my shoes? I would never fall pregnant without my partner being on board so it is all dependant on him agreeing but if I can get him to agree should I go for it even knowing I may be advised to terminate again?