worried

Danielle • I have a 6 year old son and am pregnant with baby number 3! I had a miscarriage and am now 36 weeks!
So I had a transvaginal ultrasound yesterday and found out I am 8 weeks and 5 days baby had a heart beat of 167. Today my stomach is kind of crampy and my lower/middle back is killing me. Has this happened to anyone else and everything been okay?