I swear my body messes with me

Sara • I’m a 24-year-old graduate student working on my master’s in social work. I got my bachelor’s in psychology in 2015, and I live in a tiny apartment with my wonderful fiancé. 😊
So my periods as of late have been weird. Like they never come when I think they will and it's stressing me out ( which I know makes it worse but ever since my fiancé and I thought I was pregnant in September I freak out every month around the time I'm supposed to get my period ). 
My period in January was early by a few days, but it was normal. This February was a leap year and my period was late and came on the 29th. Now it's the 29th of March and I still haven't gotten my period, but I normally have 31-33 days cycles and I'm on day 30 so it's not late yet. The last time I had sex was the 11th of March but he used a condom because we always do. 
I'm wondering if I actually skipped my period for February and the period I had ( which was also normal ) was for March, because that would explain why I haven't gotten my period yet. Also, I have all my usual symptoms like extreme bloating and my boobs hurt a little which happened last cycle. 
Anyone have any ideas? ( Sorry if this got a little long... )