I had my periods on 10th Jan 2008. I had intercourse on 21st Jan. From 22nd Jan till 2nd feb it had been bleeding in drops. Am i pregnant?

Because the bleeding started so soon after intercourse, it is probably not due to pregnancy. There is also a chance that you could be pregnant, but you need to see a doctor anyway to find out the cause of the bleeding. Any bleeding post-intercourse should be investigated as there are some possible serious causes (unless it was your first time).