Current 7dpo

Around the first time I found out I was pregnant with my daughter I had noticed this “birth mark” like mark on my belly right above my actual birth mark forming . It went from being super light to then turning pink and then turning a shade lighter than my actual birth mark . It was there throughout my whole entire pregnancy and a little after birth as well it went away completely. I am ttc for baby #2 and I’m starting to see it coming back. Has this happened to anyone before ? And no it was not there before I got pregnant the first time and I know because my birthmark on my belly is one of my many insecurities (don’t ask why) I’m not saying this is a sign of pregnancy either I just think it’s weird this has happened to me and is happening again 🤨