Has this ever happened to anyone??

AF was suppose to come on the 27th but i started having pains on my side and then later went to bath room when I wipped it was light pinkish redish so Im thinking it's my period done came earlier but still today it's the same! Only when I wipe!  My AF come on time every month! And I bleed pretty good my first few days! I I can go all day with just a panty liner! Now I'm cycle is going to be all messed up!!