Day 17

So I took a test and it says I'm
Not pregnant. I thought it was a birth control thing but now im unsure what's going on. I'm 17 days late of my period. And when I did research it says it could be my birth control and that I could possibly go 3 months without I period. I always have been regular so I'm a little confused. I got off the pill 28-29 days ago. I need some help and advice. Should i schedule an doctors appointment  now or wait till my next cycle? Which would be in 6 more days. (The 16th) or what? 
With my first child I had no symptoms and was always sleepy. I feel the same now but also I get cramps sometimes on my left sometimes right side and feel bloated. I haven't pooped for a day now and I even get tired a lot more easily. I work with kids and I have been feeling like I can't keep up lately. I'm also having a hard time staying asleep and at first I thought it was stress but now
I'm unsure. I guess I am kind of stressed now because I'm worried that i won't or get my period. I always feel or think I got it and have watery discharge. It doesn't stink or anything. 
Thanks again ladies. 
Please help me or give me some advice.