When you have sex and intercourse without using contraception - such as condom, you may become pregnant or make your partner pregnant.
When can a woman become pregnant?
Girls and women can get pregenant when they start ovulating (releasing eggs)which happens right before the very first menstruation, so just because you have not menstruated yet you should still protect yourself against pregnancy - the best way to do this when you are young is by using a condom.
After girls and women start menstruating they can become pregnant when they ovulate. This normally happens 14 days before the next bleeding starts, but it can happen at all times during the menstrual cycle. Some calculate with "safe" days during the menstual cycle where you do not risk getting pregnant. These days are very difficult to determine since you never know exactly when you are ovulating andtherfore risk getting pregnant, and the best is therefore to always protect yourself against pregnancy when having sex - regardless of where you are in your menstural cycle.
When can I detect a pregnancy?
After having unprotected sex you will be able to detect a possible pregnancy within a few days after you should have begun to menstruate according to your normal cycle. You can use either a pregnancy test bought over the counter at your local pharmacy or drug store to see if you are pregnant, or by a urine test done at your doctor’s office.
After having unprotected sex you will be able to detect a possible pregnancy within a few days after you should have begun to menstruate according to your normal cycle. You can use either a pregnancy test bought over the counter at your local pharmacy or drug store to see if you are pregnant, or by a urine test done at your doctor’s office.
If you think that you may be pregnant
If you have had unprotected sex and you suspect that there is a possibility of becoming pregnant you can use "The Day After Pill" within 72 hours after having sex to avoid getting pregnant. The pill can in most countries be bought over the counter at the pharmacy or drug store.
If you suspect that you may be pregnant it is very important that you talk to your doctor or health care provider as soon as possible in order to discuss whether you should complete the pregnancy or not, and in case you choose to do so make sure that you get the proper medical attention during pregnancy. 
