I Don't Know If I'm Pregnant Or Sick....

Ok, I was due for my period may 30. I'm on birth control. I recently switched to a new pill this past month. I didn't get my period on the 30, but had slight bleeding on june 3. I know birth control can make you very light and especially b/c I switched. When my boyfriend and I have sex, he always pulls out and plus i'm on the pill. I finished my period about 3 days later and it was still light. I took a test on june 6 and it showed negative. Everyone keeps saying they think i'm fine. It's probably my mind over matter. I always make myself nervous. Before I was due for my period I was stressing myself out thinking I wasnt going to get it which doesnt help at all. I mean the test was taken about a wk or so after my original period was due. Lately, my stomach hurts sometimes. But I have upper back pain on the one side where my kidney is. I've had to pee a little more often. I feel bloated and getting a pain on my right side where my ovary is. I went for a urine test today, b/c they think it may be a kidney infection. I know that all sounds stupid, but maybe someone will know what they think it is. Thanks to anyone that writes back!