When I was pregnant both times, I started feeling sick the week I was supposed to get my period and I KNEW I was pregnant. Peeing on the stick only confirmed my instincts. My cycles used to be 28 days exactly so yes, possible.

I was on the pill. Took it religiously 8pm every night. I also knew absolutely that I was pregnant before waiting for the missed period, my body was so in tuned to the changing hormone levels.

I wanted to. I was actually excited to get my very own IUD (Mirena) and be off the Pill forever! Until my cycles flipped... I would bleed/spot for 3 weeks and be free and dry for 1 week of the month. Sex life plummeted, sanitary napkin budget skyrocketed. One year later, I humbly made up with the Pill.