Clomid and Low Sperm count

So I am trying clomid this cycle 100 mg cd 3-7. I am now cd 8.

My husband has low sperm count and we were told IVF will be our best option. I can’t go on his health insurance until April so we are trying clomid before then. My insurance doesn’t cover anything infertility related so I am not going in for follicle checks and such more just see what happens. I will just be checking for ovulation with bbt and opks (clear blue advanced).

Fertility specialist is not confident it will work (I wasn’t having trouble ovulating).

So my question is why are people told not to have sex too much in the fertility window? I gather it’s fear of multiples? Those be monitored what was said to you about the fertility window