On The Pill, Period Keeps Stopping And Starting & I Have

Okay, i need help. I'm On birth control, ortho tri low, but, i dont always take them on time, like different times every day, sometimes i miss it all together and have to take it the next day with the other, but ive been trying to remember and i thought i was doing good and stuff, but then 2 days before my active cycle was over, right before the week of inactive ones when you get your period, i got mine. but it wasnt normal, it was like way dark and clotty, so, i just ignored it and actualy took the next 2 pills anyway on time the next 2 days, but, the evening after my period started, the next afternoon, it was tottally gone, so it lasted barely a full day. that was a monday, and my period should havea ctually began on tuesday, and lasted a week, so, it came and went before it usually even starts. so, i started freaking out, cuz i still had cramps, im still moody, i have the munchies like you wouldnt believe, all the time. and like, i love sushi, my mom brought me home some and the smell of it made me want to puke. but, i only woke up one morning with nausea, but didnt throw up. so, i was getting worried about this pregnant thing, but, now its wednesday, and my period came back this morning, like still kinda dark and clotty, but not as bad, so i was all relieved, but, now its 4 30, and already, its very light and barely coming out, and i still have all the other things going on, the moodiness, cramps, munchies, when usually, once my period starts, all those signs of pms go away, like the stomach aches and the mood swings, like, im just freaking out, is any of this normal? my period has never stopped and started like this before and im 18, and since i started the pill, like, 6 months ago, ive never had it even a day late or a day early, it always started on the very first day the inactive pills started and ended on the very last day of the inactive pill week, so, ive had some worries and questions, so, i need a more experienced opinion on this, should i go to t he doctor for a pregnancy test? or am i just reading way too much into this?