I have been on the pill for three years and have not a had a period since. Last week my boyfriend and I had unprotected sex. He did pull out, but I know there is precum. Ive kind of felt car sick in a way for the past two days. What are the chances that I could be pregnant? I dont know much about ovulation and what not, so does not having your period greatly decrease your chances of getting pregnant? I have always been so curious about this. Please help!