9 weeks and spotting, went to dr., curious what you think

Ashley • We have 2 babies already. Looking to complete our family with one more!
Okay so the other day I posted that I am 9 weeks and bleeding. This was saturday morning it is now tuesday morning. I am having no cramps but still spotting pink and it's light to medium on the tissue. I went to my ob yesterday everything is fine. Baby was squirming, heartbeat was a strong 170, and my cervix is closed. Why am I bleeding. My dr said everything is great. I'm not stressed out about it bc I saw my sweet baby swimming around, I would just like to know if any of you ladies are experiencing bleeding while pregnant. Could it be bc it's around my period time and my body is bleeding out of habit?