At 9 weeks, it could very well be ligament pain, if the pain persists, gets worse or is accompanied by bleeding with clots I would go to the ER ASAP! I had the same exact pains at 9 weeks, and it was ligament pain.
Honestly It could be absolutely nothing, is the pain really bad? if so go to the emergency. hey will not look at you funny if you are worried about something,Other then that it could just be ligaments stretching. I hope all goes well