4 Days Late - Idk what’s going on ?

Okay so my period is four days late now. Took two test, one at 8pm and the other with first of the morning urine. Both were negative, made an appointment with the doctor to get it checked and go on BC today at 3pm. My cervix is low, hard, and closed like it would normally be before my cycle starts and I’ve been getting a faint pinkish orange tint to my creamy text cervical mucus. Is this my period trying to come or something else entirely ? I don’t think it’s implantation blood mixed in because as I said earlier it’s four days after my start date but what do I know. Please comment on what you think. Thank you