Hopefully Paranoid!!!

[bugsy25]

I started taking birth control pills 1 month ago.  I only took them for that 1 month because I forgot to take them for a few days out of the month.  I figured I would let my cycle return to normal, and not take the pills for the next month.  I was planning to start them correctly once I received my next period.  During the month that I was taking the pills, I had unprotected sex right before I was supposed to get my period.  My partner said that he did not ejaculate inside, but I know that there is no way to really tell if something was 'left behind.'  I decided to purchase Plan B, the after-morning pill, the next day just as a precaution.  I did get my period, but it was MUCH lighter than normal.  I took a home pregnancy test after my period to make sure that it wasn't actually spotting.  It came out negative.  As I planned, I did not take any pills this month.  I should be getting my period now, and I have had a lot of cramping for the past 2 weeks.  But it still has not come, and I am really nervous that I might be pregnant.  I have taken 4 more home pregnancy tests on different days, all in the morning, and they have all been negative.  Am I being paranoid?  Is my cycle acting funny because of the pills and Plan B?  Any opinion you could offer on the liklihood of pregnancy would be greatly appreciated.  Thanks!