Hi My Name Is Kayla And I Worried About My

Hi my name is Kayla and I worried about my body. For the last three to four years my periods have been normal but the last 3 months of my periods I would start another on two weeks later so on September 12th thru the 15th I had my period the on the 28th thru the 2nd of October after a few days of being off the last period I spotted for 2 days then stopped I ended up going to a doctor and I got blood work done and a pap the paper came back negative thank God and he said the lining of my uterus and everything felt normal.... well I haven't had a period since then and he said they were irregular and that I didn't ovulate in April which was my last Visit and my thyroid test came back negative as well so now I feel much heavier and my breast have been sore since my last period and my stomach feels crampy and weird as well and I keep thinking maybe I am pregnant or something is really wrong with me and I'm scared I have read that blood test for pregnancy can be negative and you can still be pregnant there was an ultrasound done or anything just the paper and blood work please help me..... I've been sick and having a uti and I've been taking antibiotics...