Iam 21 now and about a year and a half ago I used to have irregular periods as I had appendicitis but it was removed a year ago after it ruptured, since then I had regular periods on a 30 days cycle. I had unprotected sex on 4th september and I was also probably ovulating that time, about 16 days later I had my period on time which lasted for 3 days so I didn't worry that I could be pregnant. I was having frequent headaches and felt bloated almost all the time after that period till now, and this month I missed my period its been a week. And I also noticed that I'm having increased urination since last week after missing my period, could it be PMS or could I be pregnant?