My LMP was in Aug and during the whole month of Aug, my husband and I did not have sex. The last time we had sex was in the first week of September and how lucky that I got pregnant. Today Oct 7, I had my first ultrasound. According to my LMP date, they said that I am about 7 weeks pregnant. Then I asked if I could hear the heartbeats. She said it's still too early and I have to wait a little bit. Is that normal?