Pregnant or not?

So i took my last birth control pill on Christmas Day and on the 30th i had my period just after 16 days i finished the previous one. I noticed it lasted only 4 days and it looked like a normal period for me, it's just weird because i've never had my period so short, usually 6-7 to sometimes 10 days even with the pill. 
Then on my fertile days I started to feel really sick and dizzy. Painful cramps, worse than my period, nausea every time, most of all when i wake up in the morning, bodyache, bad headaches, feeling a little tired (and I usually have a lot of energy), easily irritated, backache, and at the beginning of this week my breast have been sore.

I've been really hungry since yesterday, i could eat at every hour if it's possible and still not feeling full at all.

I supposed to have my next period around the 25th but i hope i won't have it.

Could I possibly be pregnant or not?

It just seems to be too early to have these symptoms..

I read on internet that even if you took the birth control pill for some weeks, a year or 15 years, it doesn't matter because some women's hormones could start to "work" again 2 days after you stopped to take the pill.

I'm waiting to see if my period will come regularly or not..

Can someone give me some advice, please?

I'd appreciate it, thank you!