No clue when to test

Kaley

My period is 27 days late. I’ve been on the pill for two years and during this time my periods always been regular, falling on the third or fourth day of taking the placebo pills. My fiancé joined the military in April and the first time we’ve had sex since before he left was July 24th. I was taking my pills as precisely the last two months (as I wasn’t having sex and we agreed for me to get off them when he came home) I spotted after sex on the 28th but haven’t had anything since and I haven’t taken my bc in a week. I’ve had headaches, mild cramping mostly at night, really vivid dreams, dehydration and waking up sweating the past two weeks. No af but negative tests all this week so a bit confusing. Any thoughts are appreciated!