To help answer some of your most common questions, we've talked to sexual health experts Marie Stopes International.
1. How quickly will I notice signs of pregnancy?Some women notice symptoms of pregnancy such as nausea and breast tenderness shortly after missing a period, but however there are no reliable physical signs of pregnancy within a few days of having unprotected sex.
If you have bleeding within a couple of days of sex go to your GP or GUM clinic, because it may be a sign of infection and bleeding between periods should always be checked out.
You are always at risk of pregnancy if you've had unprotected sex - you can take the emergency contraceptive pill - also know as the 'morning after pill' - up to 72 hours afterwards or have an IUD - intra uterine device or 'coil' - fitted up to 5 days after by a trained medical professional.
2. I've had a funny-coloured discharge and haven't had a period. Could I be pregnant?Normal vaginal secretions that all women have may increase and become thicker during pregnancy, but aren't a reliable method of diagnosing a pregnancy.
Vaginal discharges that seem unusual - especially if they smell bad - should be checked out because they may be a sign of infection which can always be treated. If you think you're pregnant the only sure way to know is to do a pregnancy test - if it's negative to repeat it 2 weeks later to confirm.