Help!

Alright, so here's the dealio... For about the past 5 months my period has been a little weird ... I've had it every other month.. I skipped october and december... I recently had sex with a condom on.. and to be completely real it was terrible... I'm pretty sure neither of us came (I know I didn't).. Anyways this was about 5 days ago and now I'm lightly bleeding.. have been for the past day.. I wasn't supposed to start January's period until the 21st but like I said the past couple of months have been weird. I'm pretty sure I have nothing to worry about.... especially since my mom said her period used to be this way but my period is never this light :/ 
Some reassurance from my fellow women will help a lot with my conscience 
What do you guys think??