Ovarian cysts

RM
So I have an ultrasound tomorrow, but I have this really strange pulling discomfort sensation on my left side where I would imagine my left ovary to be. I'm pretty sure it's not an ectopic pregnancy because my uterus is certainly expanding already and the doctor measured it last appt. But this strange feeling on my left ovary really has me worrying. It seems to get worse when I am bloated or gassy. Does anyone here have an ovarian cyst and if so, can you relate at all to this feeling? It's the only thing I can guess it could possibly be. Should I be worried? Not painful, and no blood. 8w5d. Thanks so much.