Bleeding

I had some very light spotting yesterday to the point I barely even noticed it. Today I’m still spotting but it’s more noticeable then it was yesterday. It kinda looks like when my period very first starts but it hasn’t gotten any heavier since this morning. I checked my cervix in the shower as well and it’s medium-high, fairly hard, and slightly open so not where it usually is when I’m on my period. I’m 6-7 dpo and 10 days till my period is due. It’s too far out to be from ovulation but it seems to be too heavy to be implantation but I can’t remember from my last baby. I would also like to mention that I’ve been underweight and only got my regular cycle back 4 months ago and have just recently started gaining more weight.