Period changes.

Well first of all, I was 4 days late than Glow predicted. Last month I was 2 days late. I've only been having regular periods since October last year because I was on birth control that prevented me from having periods. I was on the pill September- October. I got off of the pill in October. And since then my periods have been about 24-26 days a part. This month I started on the 1st and last month I also started on the 1st.

I have been nauseated during this period (I usually don't have that problem). I started later on the day (I usually wake up with cramps and AF). And I am extremely weak, dizzy, and having an awful case of the shakes. I've never had this issue during any periods before. Any insight on my situation in general? What's with the shakes? Can my periods be on the same day each month now? Thanks in advance. I didn't have periods between the ages of 17-22. I plan on TTC in July so I'm trying to figure everything out.