Ectopic or anxious?

Hello all. I’m 4 weeks pregnant today, my pregnancy tests are very strong positives. I keep having mild cramps in my uterine area, they’re manageable not too strong. In the night however I had one sharp pain, very similar to what I get during a period sometimes, it was so strong it woke me, but it didn’t persist and I haven’t felt it again. I’ve been reading about ectopic and now my mind is going crazy.... please advise if you can?

Thanks