Last night was my first time having sex. It was protected sex because he wore a condom. When he was about to cum he pulled out. When he pulled out he started masturbating and it got on my stomach. I thought I could feel it running down y stomach ast my vagina and on to my bed. But Im so paranoid that the cum couldve got into my vagina and I could be pregnant and I am so scared. Everyone is telling me Im fine but I need some advice from someone who knows about this stuff and is for sure!
The chances of you becoming pregnant are minimal. As long as the sperm did not get into your vagina you will not get pregnant.
That answers your question; now for some grandfatherly advice. I am happy to see your boyfriend was responsible enough to use a condom. Until you are either married or in a long term monogamous relationship and have been tested, both of you, for STDs you should always make sure the man/boy uses a condom. Condoms are the best thing for the prevention of transmission of STDs; as for Birth Control they rank towards the bottom of the scale for effectiveness.
Hopefully you are an older teenager, but as long as you are over 13 you can visit a doctor and ask for birth control; either pill, an IUD or any form of Birth Control you and your doctor agree is best suited to you.
By law once you are 13 years old you are entitled to medical privacy. Meaning you can consult with and be treated by a doctor without parental consent. Yes I understand some states have laws concerning certain female conditions that require parental permission to treat. Most of those laws are enjoined or have been over turned in the courts.
I tell you this for if you are going to continue to have sex you should be protected against pregnancy. The best form of Birth Control is the Pill which has been proven to be 99% effective in preventing pregnancy.
I'm including the following link which I usually include with questions from girls contemplating sex for the first time. Based on your question I think it would be a good idea for you to review the information that this link can provide you.
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