question about IUI

My husband and I did our first IUI last month, when the DR was doing the Sperm wash he mentioned my husband sperm count was really low (4 million, hes done test in the past and has well over 100million) but he said it wasn’t a concern because we were having a lot of sex prior to getting our IUI since we were in fertile window. We plan on doing another IUI next week, should we still have sex or wait till iui?

We found out that hubby swimmers are dying when they mix with my CM. Technically it would be pointless to even try right?