Question for my multigravida mamas

Im maybe 4 1/2 weeks pregnant and stated having some prominent rt sided pelvic pain last night. Somtime it is sharp, but mainly dull and consistent (ill rate it 4 at max). Im still having it and now it feels like its kinda riding up my rt side like round ligament pain felt with my other pregnancies. Can it even possibly be round ligament pain this early? It just doesnt make sense to me as om only like 4ish weeks... way to early. Im kinda starting to be worried for an ectopic bcs i dont really ever remember having somethin like this with my others. I am also thinking its my corpus lut cyst from where baby possibly ovulated from but the pain is bothering me at times that makes me nervous. Im going in tomorrow for an ultrasound to confirm how far along i am (was on bith control and used condoms, so not really sure where im at other than positive OV test) anyone had similar issues or found out it was an ectopic?