Back pains?

So I'm 6 weeks and 4 days (just heard a good heart beat 2 days ago) and I was paying down in bed ( on my stomach) and all of a sudden I got some really bad cramps on my lower abdomen and my lower back. It lasted only about 5 seconds but I'm kind of worried. Also just right now I had some sharp pains on lower back right where my right venus dimple is. Should I be worried or an I just over analyzing all my aches and pains? 😅

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