I have been on Tricyclen birth control for over a year and a half now, and about 4 or 5 days before my period was supposed to start, I started to notice some spotting. It's not red like when I first get my period either, it's more of a yellowy-brown color, and is not very heavy. I am expecting my period in the next day or two. I've read that spotting about the time of your period is a sign of pregnancy. Or maybe this is something else all together....