Baby questions

Jeannie

I was wondering I am suppose to be 8 weeks pregnant, but yesterday I was at the doctor and had a ultrasound and the u/s guy said he couldn't see a heartbeat, he got my doctor to come in and have a look and they seen what they thought looked like a beat but barely, I am to go back next week and have another ultrasound to check to see if it is easier to see or not. I'm trying not to worry but I am a little because I had some lower abdomen cramps about 2-3 days prior that seemed pretty bad at times then they just stopped and I haven't really had cramps since. I'm hoping that doesn't have something to do with why there is no easy to see heartbeat. I haven't had morning sickness, although the doctor said that was ok. My chest has a little tenderness still, I'm just wondering should I calm myself down or be worried? Next week feels a long ways away 😕