Had sex the 17th, 23rd, 27th, And 1st. Used a condom all times. But the 30th I was throwing up and had diarrhea. The 31st I was fine. Then again the night of the first, a while after I had sex of course, I felt sick to my stomach but i was comstipated. I’ve been fine since. I’m supposed to start my period today. But haven’t yet. Could I be pregnant?