Ive recently went on the contraceptive pill whilst my bf was on holiday.
I had been on it for 21 days, when i had sex with him (as he had returned) so my break on the pill was due the next day.
I had not experienced any bleeding before this time.
Whilst we were having sex i looked and noticed that i was bleeding.
Maybe 3 or 4 tablespoons of very red blood. (nothing like my period blood)
I was unaware of the bleeding until i saw it and it caused me no pain or discomfort.
I have never bled during sex before, what could be the cause of this and is it dangerous??
Thanks.

It could have something to do with going on the pill. Once you have, it can take several months before your body becomes accustomed to it.