Extremely confused

Jenn • Mom to Tricia (9/25/00), Damian (3/11/03), Genesis (4/20/04) and baby #4 due 12/25/18.
I'm very confused. 
I got my IUD out in January. February I started getting high/peak readings like I should. 
February, March, April were normal. All about the same but we didn't get pregnant. 
May. May has me scratching my head. 
I have been getting HIGH days for 2 weeks. No peak. Then, I got my period yesterday (21st) which isn't due until the 20th.  9 days early. Every month since January, My period has came the day Glow expected it to come. 
The blood is bright red. Clots. I have cramps. What is going on? Any help would be great.