Advice please !

Monday night I felt fine , woke up around 2:40 am & had to pee .. after I went , my pelvic area felt kind of heavy but I thought nothing of it so I went back to sleep .. woke up later that morning (Tuesday) and all that day I’d been having sharp shooting pains on both sides of my pelvic area & also in my back .. I went to the hospital & everything looked fine , ultrasound was fine .. they really couldn’t pinpoint what the problem was & I am still having these pains now .. I am 7 weeks & 4 days , is this normal ? Or should it be a cause for concern ?