So my SO and I had sex about 4 days before I am supposed to ovulate according to this app.

We used a condom and thought everything was fine. My period can be kind of irregular some days 29 others 30 days. My period was late by 3 days and now I have a steady flow of red light blood and some clots here and there. My period only lasts 4 days normally. I have spent DAYS on the Internet trying to figure out if it is a weird period or implantation.

Does anyone know? I am feeling tired and back pain and mild cramping like I normally do on my period. There is just a lot less blood than normal...