Any chances?

I didn't have sex. Just dry humping with jeans on and my boyfriend never ejaculated fully. He just a had a small Precum wet mark on his pants. So I've taken 3 pregnancy tests over a period of a month and a half. And they all came out negative. I have really irregular periods but recently have been getting regular and I've been getting my periods as normal periods like with blood clots here and there. But I have like a ball in my stomach from my uterus to my bellybutton that I can move around for the last two months. I've had no weight gain and there's no pain. But soemtiems it does start cramping where my right ovary is and i also my lower right back starts cramping as well. I'm not sure what this is. Please help