totoo ba yung safe days to have sex?

F, 21. My bf and i had sex and pinutok niya sa loob yung anes niya kasi nalaman niya na "safe day" ko nung araw na yun. Upon knowing it, uminom agad ako ng 4 trust pills then after 12 hrs sinundan ko ulit siya. it's been one week since it happened and I'm still thinking about it? di pa ako ready mga mhima.

UPDATED: JUST GOT MY PERIOD TODAYYY HEHEHEH