Can’t get pregnant after stillborn

Hey everyone, I had a stillborn @ 25 weeks on 31st July and two months ago was given the okay to try again but I can’t get pregnant as easily now. I’ve had 4 miscarriages not including my stillbirth and every time I tried in the past I’d get pregnant straight away If I had sex when I got a smily face EVERY TIME! Now I have sex when I get a smily face but don’t get pregnant. I just want a baby and now ppl are willing to help me and I can’t even get pregnant again.