I'm six weeks today. It's been years since I was pregnant. I just always remember nausea hitting me hard with my other two around this time. Went to my Dr's Tues. She saw the yolk sac... said it was "very reassuring" I go back the 15. Still too early for a heartbeat. Should I be concerned ? She didn't check my levels but I'm assuming since everything seemed fine that's why. I have had on and off symptoms. Extreme fatigue, breast soreness and some cramping but no spotting or bleeding at all.