Light pink spotting? Cyst?

Hello, everyone! Yesterday (at 12 DPO) I had a light pink spotting on the toilet paper. I thought it was my menstruation and got a pad. But it was a one time thing. I never spotted again. My AF should come in three days. I am afraid it may be a cyst or something. I don’t think of pregnancy as a possibility because we use condoms. (I had a son in 2020). Any ideas if this is normal?