hi , im due for my period this week but it hasnt come, i thought it had yesterday when i started to bleed alittle, but it was light pinkish blood only after using the restroom as i wiped, then it turned brownish, now today im experiencing clear discharge with light pinkish blood strings as i wipe? what could this be? could it be an early sign of pregnancy? or is this an std? is it serious that i need to go check it out? or is it totally normal? because ive never had this before.