[Always *]

So, I'm not sure if this is the right place for this topic, but I don't know where else to put it.

I'm on birth control (the pill) and I switched to a new kind I think in January or February, which has actually been fine because it is pretty much exactly the same as the one I was on before that. Only this last week I was supposed to have my period. It basically lasted a few hours. I kid you not, like I went to the bathroom, nothing, few hours later, a teensy bit of blood, and then NOTHING after that the rest of this week, and I am a bit concerned because I usually have a period that lasts 3-4 days, I have NEVER only seen a tiny bit of blood (to the point where I basically never had my period)

I am pretty much 100% positive I can't be pregnant cause the last time I had sex was in like September which would make me 8 months or so along by now and I'd be showing.... But in any case, is this normal? Like has anyone else had experiences similar and/or can maybe suggest what is causing that? Also, no, I am not under any unusual amount of stress nor have I made any large dietary changes. The only thing I have done not usual was go on a trip out of the country (where I never went swimming, and avoided foods such as lettuce that could make one potentially sick) and I haven't been to the gym in 2 or 3 weeks. But seriously, stuff like that isn't THAT dramatic... So?? I'm just not sure if I should go see my doc or leave it be and see what happens next month...