I have done a lot of research on pregnancy and symptoms over the past few years, but for this I'm a bit quizzical and would like some help!

AF usually comes on the 5th of each month, as it did this month (July). On the 19th of the month while my boyfriend and I were doing the dirty deed, the condom broke and neither of us knew before it was "over." The day after I started have cramps, felt like AF was coming, almost identical. Then, today, 3 days later, I had a light bleeding, hardly anything and that is very unusual for me, especially so far away from my period.

I know signs this early is very unlikely. I get checked every 3 months, just to be safe so I know I am clean. Could this be the beginning of pregnancy?

You had sex, so pregnancy is definitely a possibility. There would be no pregnancy symptoms this early on.

You'll have to wait until your period is due. If you miss it, wait 2 weeks, then test using first morning urine.