Pain in early pregnancy

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I am almost 5 weeks pregnant and about a week ago I felt a quick fleeting pain on my right side on two separate occasions. It wasn't awful but it wasn't cramps either. I had an ectopic pregnancy this time last year and they removed my left tube. I am terrified that I am having another ectopic. On a side note, I also have endometriosis. What I want to know is: has anyone else felt a super quick pain on one side during early pregnancy and is it normal? It wasn't bad at all maybe like a tiny muscle pull that was barely noticeable but I am on hyper alert. Going for ultrasound Thursday my levels were taken Monday and had almost tripled by Wednesday.