Hi I had my last dose of antibiotics for a chest infection last Thursday and I am on the pill and last night my boyfriend and I had unprotected sex last night. Will there any chances I could be come pregnant. My LMP was August 1-5 and I calculated I ovulated maybe the 14-17..

What are my chances?

There is always a chance of pregnancy with unprotected sex,that's how its done!

The antibiotics will have effected your pill,I would advice you speak to your doctor.

If its been less then 72 hours you might be able to avail of the morning after pill.