Chances of a boy or girl?

Hello, I'm new here. This is a great site! Anyway, I am just over 15 weeks pregnant, and I wanted to sway in this pregnancy, but the month that I didn't worry about swaying I got pregnant!! We really wanted to try for a boy because we have a beautiful baby girl and would love one of each. Anyway, for 2 months I used OPKs, watching for ovulation signs etc to try to get as close to ovulation as possible. I actually can experience times of anovulation and for those couple of months I didn't ovulate. So I thought my body was going through one of it's weird phases again of not ovulating and the next month we just had sex normally and not worrying about it. We had sex 4 days in a row at one point and then the next day I ovulated. I experienced my ovulation cramps and spotting (which I do get when I ovulate). So I was wondering 2 things, I know those are signs of ovulation - but do those signs happen before, during or after ovulation? And having sex the 4 days beforehand - does that give me a higher chance of a boy or girl?