Dull ache in left pelvic area

I could use some advice. I am currently 5weeks and 3 days along and have been having the usual AF like cramps since before my BFP. Those seem to have subsided over the past 2 days only to be replaced by an almost constant dull ache on my lower left side (same place I usually have O pain). It sometimes feels like it's right in the joint of my hip and leg and other times it is higher up by where my hip bone protrudes. I am worried about it being ectopic! It's not overly painful, more annoying at this point. Could it be a corpus luteum cyst? I don't have my first visit with the OB until next week. I am really hoping it is nothin serious. Thanks in advance for any advice!