(pcos case) Meprate periods and

I had unprotected intercourse on 2nd july(just the next day my last periods got over) but had the morning after pill within 24 hrs. Then i got heavy withdrawal bleeding for 5days just a week after it. Then i had my periods on 27th july which lasted for 5days. I am already diagnosed with PCOS so i have meprate (10mg) for 5 days twice daily when my periods are late about a month so as my periods didn't come in August to finally i had meprate for 5days in September and on 12th September i took my last dose. It's been 7 days today i haven't gotten my periods even after meprate which i usually get in 5 days around. Also i checked with utrine pregnancy test( on 5th day since i stopped meprate) which came negative. I'm having a little pain in my uterus and i guess it's a little swollen but didn't had periods. What should i do? I don't want a baby. Am i gonna be pregnant? What if periods don't come even after waiting for 3 to 4 days!?