Please help someone who knows lots about pregnancy and birth controle.?

Ok I was on the pill for 3 months and it made my periods very regular. Well I was off them for 12 days now and had unprotected sex during my should be ovulatiion time. In that 12 days, is it possible for me to get pregnant right away, and will my periods still be regular. Since I was only on for three months, will my body go back to normal right away.

Yes you can get pregnant after one missed pill let alone 12 days of stopping them.

You might be irregular with your periods for a while now you've stopped the pill. It's impossible to predict, some people will go back to periods like clockwork, some will have spotting for a bit and slightly 'weird' periods before settling back into a rhythm. Give it 2 months before you should expect to be having relatively normal periods. If you dont get a period in 3 weeks id take a pregnancy test though.

When you stop taking birth control, you stop that regular flow of hormones your body has come to expect. Most birth control packs contain advice for what to do when skipping even one day, let alone twelve, so I don't think you have any window of protection there.

3 months is the time hormones usually take to regulate in the body and sort through any side effects they're going to have. Taking them away will probably prompt your body to go back to the way it was before. It certainly shouldn't cause any lasting effects if you were only taking them for three months.

Yes, you can. You should take a pregnancy test to find out. If the test (or two) are inconclusive, you should go to a doctor to find out for sure. If you are pregnant, stop taking the pill.