Sex during ovulation and still a BFN

Has anyone had sex for three days leading up to ovulation, the day you ovulate, and the day after and still not get pregnant? I haven’t had a period since baby #1 was born. Im breastfeeding and was told that it’s normal. I’ve been using Clear Blue Advanced Ovulation to track when I peak. I waited about a month before taking a pregnancy test but it came back negative. With how much sex we had before during and after ovulation, I’m kind of shocked I’m not pregnant. I’ve been having “symptoms” so I was sure I was pregnant, but maybe it was in my head because I wanted it so bad.