Cycle

Okay my period should be over this week but when it’s over like instead of me buying a opk kit I was wondering like right after my period is over I could just have sex all the way through and then like wait and see what happens because I start to ovulate on November 27 but I will just have sex all the way through would that be good or just buy an opk kit tell me what u guys think no negative comments??? Thanks because my boyfriend doesn’t live far from me and I think this will be a good method to do so