TMI BUT I️M REALLY LOOKING FOR HELP!

Okay so i went to my doctors Friday morning due to having some light brown blood .. nothing more to fill a panty liner I’m 15 weeks pregnant and my doctor did a vaginal check and heard the heart beat said it was very strong and also did an ultra sound told me the anatomy looks healthy and couldn’t give me any real answers on why it’s happening besides to come back in if the blood becomes very heavy. I’m just beyond nervous and don’t know how to stay calm. It stopped all day and now just came back. But looks like clots .. if someone can please tell me I’m not alone & say it’s “normal” like the doctors told me ...