6 weeks spotting plz help

Hi everyone. Im 6 weeks pregnant. Im a new swimmer and went to pool al by myself to swim that was my first day. It happened the day before yesterday and yesterday I started sporting pinkish-red. So scared and went to er they have made abdominal ultrasound and few blood works. Everything came back normal. Im so scared that swimming caused some sort of trauma and caused hematoma and bleeding. Plz give me some advice. Do u think can we get hematoma from swimming and cqn doc see it in abdominal ultrasound not vaginal plz help