Sex advice

Hi all, this is my first time posting, so I hope i don’t ramble too much! My boyfriend and I have been together for a little over 3 years, we live together and have been trying to conceive for about 3 months.

He takes some high dose antidepressants and has a bit of an issue ejaculating. He explains it like he gets to the point when he is about to cum but then it doesn’t happen. Now this doesn’t happen every time, but it happens more often than it doesn’t. I hope that makes sense.

It has caused some tension lately since we are TTC. I have tried suggesting different positions but he doesn’t seem interested.

Any advice would be great!

Thank you!