Period! Or pregnant help please

On the day of my period I got brown discharged and that's how it was for the rest of the week brown discharged. Then 3 days later I got red slime. After that it went away. My boyfriend broke up with me and my period is 14 days late. We had sex on June 18 with a condom. I am just scared that I'm pregnant. I took a test on Monday the 26 of June, July 3rd and today. All test came back negative. It's been 2 weeks that I haven't gotten my period. I'm extremely scared because I'm going off to college. My mom said that she is cramping a lot. She got her period last week. I feel bloated and I get light headaches and I got acne.