anul sex

i was having anul sex with my boyfriend today for the first time and we used lube but was very painful when he stoped because he saw i was in pain he saw blood on his dick and asked me if i was bleeding i said i don't know so i got up and went toilet but was weeing blood ( not on period at all ) then i went for a number 2 couple hours later and the pain was unreal plus there was still blood and iam still bleeding now but there is no vaginal bleeding at all