there are plenty of things it could be and without more information I can't really narrow that down for you.
Are you on birthcontrol?
On average, how long do your cycles last?
Do you know
50 Things Everyone Should KnowHow To Doby
to keep. There is also no reason why you should have to make a decision on the spot about someone you hardly know.
Tips... of only one.
While not totally comprehensive, here is a list of 50 things everyone should know how to do.
"‘…good reason to know’!!!???…" ...by
“‘…good reason to know’!!!???…”
The government plans clampdown on vandalism after lobbying... on a register, which would only be shared with people who apply and who can prove they have good reason to know...