Need help!!

Okay so my last period was April 7th and glow said i was most fertile on the 22nd, my fertile days were (21-27) but the 22nd was my best chance. Since the beginning of May I've been getting super nauseous, very fatigued, dizzy when standing, walking or sometimes just sitting and peeing a lot. I got a "period" on Saturday May 11th, that was really a period, not filling a tampon, no cramps, no clots and no blood when I wiped, which is very unusual for me. I was wondering if maybe I ovulated later than glow said and it was implantation bleeding. My original period was due May 9th so it was 3 days late and not a period at all. Any ladies with an input or who have had this happen please let me know! Thanks!!!