What are the chances of getting pregnant?

I've only recently started having sex, it was about 3 weeks ago, and im just terrified I'll get pregnant, im 16 and everyone keeps going on about how I have to make sure I dont ruin my life by getting pregnant. everytime me and my boyfriend have had sex...

we have used a condom, but im still terrified that I could get pregnant, what are my chances?? what can I do?? I dont want to go on the pill, I know im likley to forget to take it and that wud scare me even more with nothing 'physical' if you get what I mean as a prevention. please help!

Using a condom is a pretty good way to stay protected, but it's not 100% effective.

Unfortunately, the only true method to prevent pregnancy is to abstain.

Well there are other hormonal contraceptions, like the depo shot, or the patch, if you use a hormonal form as well as a condom, you can relax, odds are pretty low

Itchi and ty has good advice.

Also remember that there are a lot more birth control methods for you to look into. Also once you get into the habit of drinking the pill - which is easy if you set an alarm for it you basically never forget.

Here's a site to help you research other options:
http://www.womenshealth.gov/faq/birth-control-methods.cfm

if youre worried about forgetting the pill, talk to your doctor about getting the birth control shot. personally, I think birth control is great, because it not only helps with pregnancy prevention, but it also lightens/regulates your periods, and helps your hormones balance out-which could help your growth and developement.