advice...

Clearly nothing is wrong with me because I have one kid outside of my relationship and me and my partner are TRYINNNNNG for a kid and we believe that his sperm count is low or his mobility (or something) my ovulation day is coming up soon and I'm trying to figure out what I can do to help conceive THIS time.... any suggestions or advice???!!!!!! 😬😬 
I've used opks and bd on the day