Heh, i'm on ortho tri cyclen lo as well and also on my first cycle so I can compare notes. :d
i was on depo before this, though, and i'm not sure if it's still having an effect on me while i'm on the pill. Anyway, i'm on my last week of active pills and started having breakthrough bleeding on monday, a week before my scheduled period. It's nothing to bad, a dime of red blood about twice a day for monday thru wed, nothing yesterday( today is friday, of course) and just brown gooey stuff today. So I guess you're not the only one.
Anyway, here's some reading up on specifically otcl:
less then 1 in 5 people on it have breakthrough bleeding the first month (so less then 20%)
of those people, 1/3 to 1/2 of them won't have any breakthough in their 2nd month. So atleast things will hopefully get better.
Of course, if you have it byu the 3rd you may want to consider switching.
That's all from ortho's website based on a study so i'm not sure if it's near the real life occurances but it's good to know anyway. I'd say stick with it for 3 months. Or if you don't want to be on it because you're not having sex then tell you're mother to screw off. It's a perscription medication that you shouldn't have to use if you don't want to and have no reason to.