TMI alert, sorry, but I'm a bit worried and need advice. 
I've been on the pill for about a two years, I decided to stop for many reasons in October/November, I had a period and a month later had another normal, naturally occurring, period.
Then, just before Christmas, I realised that I had to go away at a time when my period was due and the circumstances were very inconvenient. Because of this I decided to start taking the pill again to postpone my bleeding.
I've just finished the pack now and have started my period again, but although I've always had small clots, I'm finding much larger pieces of, I don't know, membrane? They're not as dark as my usual clots, but mostly red, however small parts of them are sort of milky white. 
Any reassurance/advice would be very very appreciated 