Can you get pregnant by bd only once every cycle?

I was wondering when ttc, during every fertile cycle, can you get pregnant by only baby dancing once during the fertile week?

I’d prefer to baby dance every 2-3 days during my fertile cycle but my fiancé seems to hate having sex with me since I can only convince him to baby dance with me once lately during my fertile week. We’ve been ttc since thanksgiving of 2022. We did manage to get pregnant after 10 months of ttc but that ended in miscarriage unfortunately. It’s been 6 months since that miscarriage happened and we’ve been trying since December to conceive and of course no luck so far. How can I convince my fiancé to put in more effort in this journey?

He always talks about how he wants another baby and how after we have this next baby, he’s going to try to get me pregnant sooner so we can pop a bunch more out since he wants his own little tribe of kids. But so far it seems like actions speak louder than words at this point. His actions of not wanting to put in the effort to make a baby is very frustrating to deal with. Every time my period shows up it makes me sad and wish we tried harder. I just don’t understand why he wants to basically avoid sex during my fertile week.

We’ve been together for almost 10 years now. When we had been dating for 3-4 months, he told me he preferred to jerk off to porn than to do anything in person because it was more convenient and efficient to do that so that’s why he always chose porn over me. Anyways I’ve banned porn in our relationship since it became a huge problem so he is now no longer allowed to watch it if he wants to be in a relationship with me. If we do any sexy time it’s always him choosing to get a bj but with me under a blanket. I feel like it’s his way to hide me and I don’t like being under a blanket like that.

Anyways back to my fertile week, I always tell him when it’s that special week of the month and it seems to annoy him. A few months ago when we were walking around a store, he told his friend on the phone with me next to him how I’ll tell him it’s ovulation week and how that turns him off and it makes him uninterested in having sex with me because ovulation week feels like a chore to him because you have to have scheduled sex basically. He prefers to have unscheduled sex which is totally understandable. Anytime it isn’t fertile week when we can have unscheduled sex, he never chooses to have sex, just ALWAYS chooses the bj & me being under a blanket thing and that’s just weird imo. I thought most guys would prefer sex than getting bj’s you know?

Another thing to note he is around 330-350 lbs and in the past he said that probably affects his libido and if he loses a lot of weight he’d probably be interested in sex more. When we first met, I was 20 and was 75 lbs and he was 23 and he was probably like 230-250 lbs, pretty tiny back then. I’m not going to be mean and tell him he must lose weight so we can have an active bedroom life again, I’ve been leaving it up to him to choose if he wants to lose weight or not since that’s his own choice. I’m now 30 and he’s 33 so idk if our age makes a difference in this ttc thing. Sorry for making this so long, I just figured I’d give a little background into the past to maybe explain our ttc issues.