Had my period but now its light pink?

So i start my period with brown discharge and it turned bright red like normal but after two or three days it turned to dark brown which happens to me when my period is about to end so i thought it was ending because i started the 25th so its been a week now but after i had sex with my husband i went to the bathroom and instead of dark brown i had light pink discharge is this normal? Is there a possibility i might be pregnant?