Change in CM question

My past 2 cycles I've noticed my CM has been a bit pink about a week before I start. Sometimes it can be a little darker and I'd almost consider it spotting. I'm a week out of my cycle this time and it's doing it again. I am wondering if I should call and make an appointment. I don't want to if I don't have to, so I'm wondering if anyone else has had this issue and if I should go in.