Trying to get pregnant! 😬

Okay so I recently had sex valentines weekend, my boyfriend and I have been trying to get pregnant for a solid year. I feel like we keep missing the deadline, so I got off my menstrual on the 10th and I had sex that whole weekend, my ovulation started on the 18th and my menstrual comes again on March 8th. I was wondering was I doing wrong because my menstrual feels like it might come next month because I'm already experiencing tender breast. Any advice or comforting words????