Am I pregnant? Day from 1st intercourse.

I had unprotected sex on the 14th day of my period incidentally. I took an i-pill within 4 hours of the act. Within 71 hours (approximately) I had unprotected sex again. This time I did not take an ipill as I figured it could be harmful to my health. About 7 days after the first intercourse I got a very light bleed for 3 days (the first day was just spotting). *The last time I took an ipill was 4 months ago, and within 3-4 days of taking the pill I got a very heavy 2 day withdrawal bleed.* I got my last period on 6th November (my periods are usually regular) so I was supposed to get my periods on 4th-5th of December but its 8th of December and I still haven't gotten them. I'm experiencing many of the symptoms of PMS- backache, cramps, mood swings. I'm getting the occasional nausea. I've been sleeping much more than I used to. Today I went for a run (as usual) but I got severe cramps in my lower abdomen so I had to stop. Got 2 negative tests on 10th and 13th day from 1st intercourse.