6 weeks with endometriosis, normal?

I am 6w1d with my first pregnancy and have been trying not to worry about every little thing. The reason I'm a little more iffy about things is because I've been under close watch from my OB for the last two weeks because I have severe endometriosis and have had two laparpscopic surgeries last year. I have my first ultrasound tomorrow and am just so nervous to see if everything is okay.

I only had minimal brown spotting around the time my last period was due and haven't had any since, but every so often I will get a cramp around my uterus that is 8/10 on the pain scale. It last about ten seconds where I'll be doubled over, goes away and only happens one to three times a day. Is this normal for everyone? Could I be stretching around my scar tissue? Should I bring this up to my doctor tomorrow or I am I being too worrisome?