Linea Nigra? First pregnancy

Tatyana

After taking a shower this morning, I noticed my linea nigra is so prominent. (All the way from my pubic bone up to under my breast bone which is indicative of a boy per the old wives tales) I'm only 7 weeks 1 day. Didn't know that line showed up so soon. I also read that early linea negras could mean twins? Anyone else noticing this so soon.