possibly pregnant? Unusual period after unprotected sex

My fiance is allergic to latex so we have been using the "pull out method" for a year. He has ejaculated in me a few times before but we always used the Plan B pill. This last time we chose not to get Plan B and just let nature do what it does best. 2 weeks later I noticed a pink color when I wiped, but I thought maybe I was just about to start my period. That lasted for a day and a half, so I really thought I was pregnant. 2 days later I started my period with very heavy bleeding and it slowly decreased in flow for 7 days. Now, it is a month later and I should be starting my period in 5 days. I'm thinking I still might be pregnant because I have never had that pink discharge before and usually my periods start with the usual brown and red blood and get heavier the second day and slowly decrease. If I am pregnant It would be great. Unfortunately I have drank alcohol a few times since then, thinking that I'm not pregnant. I have heard about people still having their periods when they are pregnant and I'm just curious if my case is the same.

Any input would be helpful...my fiance just gets freaked out when I talk to him about it. haha