i lost my virginity to my boyfriend. he wore a condom and even pulled out before he came. this was in july. my periods in august and september have been a little abnormal. I have bled heavy but for only 2 and a half to three days. my periods usually are heavy and last any where from 4-5. Can losing your virginity cause a change in your period, or could i be pregnant? I have had trouble with cysts and missed periods occasionally before but nothing like this.