My husband and I were intimate the other day and I felt a lot more muscles stretching in my lower abdominal area afterwards. It comes and goes...is not debilitating and there is no spotting or bleeding. We also just had a successful ultrasound a day or two before and everything was great (baby is very active with a strong heartbeat). I am 11 weeks and this is my first pregnancy so I am tending to worry. Are all these stretchy feelings common? Thanks ladies!