I too was and am having the same problems and it sometimes comes w/ sharp pains shooting up under my rib cage. Im just now 8 weeks and started having the pains about about 6 weeks. This is my second child and the first preg was a MAJOR piece of cake besides the first trimester 24 hour a day sick to my stomach!!
Anyway I discussed w/ dr and it was found I have a cyst on my right ovary. Which after I researched was found to happen in some women during pregnancy and most times reduces as the pregnancy grows. Which as been the case w/ me.
I miscarred a couple years ago in the 8th week so right now Im hoping that all is ok even though I have had some bleeding off and on during the preg and also w/ the cyst pain.
Best of Luck and have your dr check you for ovary cysts.
P.