Bleeding at 13 weeks

The other day I felt a gush and went to the bathroom and was heavily bleeding and cramping. I had a previous MC in April so I panicked. Went to the ER and after 4 hours I was scanned and the baby is fine thank God ♥️ the scan showed no visible problems to cause the bleeding and I think I over strained myself. My little rainbow is still healthy and wriggling around! Got another ultrasound on Thursday so going to double check but has anyone else had this?