Need some advice!!! Please and thank you

Jennifer

I had very light pink cm yesterday morning could see on tissue paper that was it didn’t even last but a few hrs if that. My period is due sometime between nov 8th to 10th. I’ve had total of 4 pregnancies two ended in miscarriage at 7 weeks and two went full term. But I’ve never had this light pink cm before so I thought my period would start today and nothing. Could this be implantation bleeding? I’ve heard about, but never had it happen to me before we just recently started trying again for our last baby in October.