Me and a 'friend' had sex for the first time a while ago. This was completely not planned, and we ended up having unprotected sex. I took the morning after pill to be safe, and i came on my peirod on the 12th of july, which is unusually early, as i don't normally come on till later in the month. Since then we have had sex again, this time with protection. Howver it's the 11th today, and i still haven't come on my peirod. I'm worried that i may be pregnant, even though we did use protection.
Would it be possible that my peirod was earlier last time because of the morning after pill?

Thankyou