I am 38 yrs old, and 4 weeks pregnant again after miscarrying 2 months ago. On the ultrasound yesterday, the doctor could barely see anything except my uterine lining thickening and a tiny, teeny barely visible spot that might be the sac. She says usually they don't see anything at 4 weeks and not to worry. Is it normal not to see much on a 4 wk ultrasound? Also, I don't feel any pregnancy symptoms, except fatigue, which is actually not that abnormal for me. Is this common? Thanks for your help!