Hi been reading your posts although I am too old to have to worry about periods , thank goodness .
i know it is embarrassing but am sure the staff are used to it after all if you had an accident and needed an emergency op and were having a period you couldn't do anything about it . Don't take anything without checking , I had to stop HRT before my op .
concentrate on preparing for the op after all your period may be late due to stress .
Good luck
mary
south wales