Breakthrough periods

I’ve been ttc for 5 months me and my current (SO). I called my GYN to run tests and check my reproductive system. Everything came back negative and I looked fine. I’m taking prenatal vitamins before ttc. I was told by my doctor to take folic acid. I’m also tracking my menstrual period, I purchased a ttc kit online [pregnancy test & ovulation test] inside of the box. Me and SO was intimate with each other this week May 16th and I’m not quite sure what happened but I started spotting light pink then I started bleeding red/brown. It’s Sunday May 19 and I’m still bleeding. But I had what I thought was my menstruation May 3-8 but I’m sort of concerned about that. I’m thinking about calling my gyn but I’m not sure. What would y’all do?