OPK and BD

Erin

So my ovulation checks out and now I'm curious on if we did the deed on the right days. We had a chemical pregnancy last month and he wants me to get back on birth control if it doesn't happen this month, and he's not really sure how he feels (for financial security, buying a house, etc.) I know sperm can stay in there, swimmin around, doin its thing for like 5 days, but I really wanted to have another (my 4th, his 1st) now before the kids are too old. My youngest is 4 now. We had multiple sessions on CD 15, 16, & 17.I know he's just trying to "play it safe" since he's not 100% on board with having his first child, yet, but I'm hoping it sticks.

Chances of conceiving based on ovulation and BD?