Perhaps someone on this forum is wise in the ways of these things, but sadly, I'm not one of them. My advice to you is to take your question to the folks who have prescribed these meds for you, You could also call Planned Parenthood and I'm sure someone there would be able to answer your question.
Until you DO get an answer, I think it best you abstain from sex if you are not ready for a pregnancy.
Good luck
Greenlydia