Birth Control & Period

My periods have always been off but last month I started birth control and after the first set I had a regular 7 day period before starting the new pack. I just finished my second pack on Saturday and was supposed to start my period Sunday. I haven’t had any cramps or anything just light blood that seems to be watered down and I’ve had that on and off for the past week before I was even supposed to be on a period. Before I noticed the blood/watery discharge I was experiencing clear mucus like discharge for a day or so.

I don’t know if it’s the birth control or what but last week almost every morning I woke up with diarrhea.

Is this normal? Could I be pregnant ?