Help!

Ok ladies I need some advice...im.new.to FAM and have been tracking bbt, CM, and cervix....i.checked.my cervix (4 dpo and had mild cramping felt simlar light period.cramps and i checked my cervix and when I pulled my finger out to check my cm looked clear.but with toilet paper pieces...what could this be? Yeast infection? No smell.or.itch or anything but is this normal?