If i concieved july 10 does that mean anyone i slept wit after that dad is not the dad ? i slept wit sumone on my boyfriend on july 13 just want to make sure he not a possibility?

Too close to call: That's too close to call. One should keep men 2-3 weeks apart in order to be able to predict who the father is, because the weeks of pregnancy, the differences in each man's sperm, the survival time of sperm in a woman, the ovulation day, and the conception day, are all estimates. (A simple way used over many centuries is: father of the baby is the man mother is married to.)