I am 25 and pregnant with my first. I went to have an USG on Feb 18th so we could make sure of the dates. They estimated that I was 7 weeks and 3 days by the size of the sac, but there was no fetus or heartbeat present at that time. I have been diagnosed with PCOS from last 5 years and undergoing treatment for it. I have never been pregnant before, so I am very scared and worried. I have had cramping and no bleeding of any kind. My doctor said this happens sometimes, but I am worried they just don't want to upset me. My doc advised to perform USG again after 7 days. Is this normal, has any else had this happen and how did it turn out? Please let me know.