Missed period and not pregnant

Ashleigh • Married 💍 || English Teacher || Rainbow due June 2020 🌈
Okay, ladies. I got pregnant on BC in January and miscarried in February (didn't know I was pregnant). I got off the pill in February, about a week before my miscarriage, and had a period in March and beginning of April. I was supposed to start my period 5/1, but now I'm 9 days late. I've taken countless pregnancy tests and they are definitely negative. No signs of a positive in sight. Could I be experience anovulatory cycles? I don't really have any pregnancy symptoms. Although, my lower pelvic area if sensitive to touch, and I'm cramping there and in my lower back. Should I just blow it off or what?