Unprotected intercourse, chances of Pregnancy after Levonelle morning after pill?

I had unprotected sex with my boyfriend early on day 12 of my cycle. He did ejaculate inside me. I am not on any form of birth control and never have been. 40 hours later on day 13 of my cycle I took the Levonelle morning after pill. I have had no spotting or break through bleeding. All I have had is tender nipples which hurt to touch. I have had some menstral cramps like I'm going to start my period but nothing. Its been 2 weeks since I took the pill and my period is due in 5/6 days as I have 30-32 day cycles. Last time I took the morning after pill I had spotting then my period the day after I took it which was right before my period was due but this time I had sex mid cycle, likely just before or during ovulation. Not sure if I'm pregnant as its too early to test. Anyone had a similar experience? Think I'm pregnant or paranoid? Thanks guys x