I had unprotected sex two days beforemy period and my period was on time. Even though it was on time it only lasted about 2 days. I had a medium flow to heavy the first day then it was really light. On the second day it was light and almost gone and then a little light brown discharge. What does this mean?

The sex probably interfered with your period. Yes, you can get pregnant from sex right before your period, but the odds are in your favor that you won't be.

Usually ovulation will have already taken place prior to this or not for several days after your period... but you can ovulate at an off time once in awhile and some women do naturally ovulate earlier or later than others. There is no 100% safe time... just some times that are less likely then others.