Question: could i be pregnant

My cycle is regular and for the past month I've been having unprotected sex,last time was May 18,a day before ovulation.My period wasn't due till June 6th but I started light bleeding June 1st. Started off light brown when I wiped but now its light pink,I've had no cramping and I always cramp with my period,especially the first day. This is very strange for me,can anyone help me with info on whats going on???