please help me...am I or am I not??

[confusedlady]

Ermm...Hi, I am new to all this so just bear with me okay. I have a bit of a problem. Its to do with periods. Since I am on the pill and have been for some time (about 6 years, is this okay am I damaging my health, should I take a break...) my periods are regular and I havent had any problems.
Anyway, this month, my period was late, it is usually here about 8pm, but decided to appear at 4 in the morning. I only bled a little bit and for about a couple of hours, and now it has completely stopped, nothing, this is not normal for me, its usually roughly 2 days. What do I do?? Am I pregnant?? Do I continue to just take my next pack of pills as usual??? Please help.