dumb question?

Tia • 20 years | Beautiful daughter | born 1.12.18
This may sound like a dumb question... but what if I BD every other day this entire month how much more likely would I get pregnant if I only BD my fertile days? I believe when I was pregnant before I MC I think I got conieved the last day of my period which was weird .. but idk.. not sure what to think. I really want my rainbow baby