I have been on the pill for 3 months an never missed one but have taken one late, I have just finished it 2 days ago... I had unprotected sex 3 days after I was due on my period, I am now 7 days late... This morning I was sick twice, I'm wondering if I am pregnant and it's morning sickness or it's just hangover because I drank last night?

Pregnancy will always be a possibility, just less of one when taking birth control pills. Being late may increase the odds slightly depending on the type of pill and how late you took it.

Since it has been just three months of using the pill, it could still be your body is adjusting to the changes in hormones. Try a pregnancy test, making sure that you follow the directions carefully.