I'm 5w today and I am having a terrible stomach ache right now. Not nauseous - a stomach ache like when you're 8. I've been having a very stressful week, esp today and I guess I'm just concerned I've done something and the stomach ache is more than that. I don't have a doctor's appt until Jul 11.
When I was around the 5 week / 6 week mark I had 2 episodes of stomach aches. Actually they were stomach cramps. Horrible, doubled over stomach cramps ... along with the sweats. it felt like my stomach literally turned over onto itself. I threw up the first time it happened.
Never found out what it was but everything has been fine with the baby. If yuo are really that concerned --- I would call the doctor and make them see you.