Right Side Wrong Side?????

I started a cable baby blanket pattern and I just realized I don’t know which side Is which… (right side vs wrong side)
Pattern starts by casting on 72 stitches
1st row (RS) K1 P1
2nd row P1 K1
3rd row is same as first
I just finished the 3rd row so which side am I looking at? I am new to this. I heard putting a safety pin on the RS helps I just need to figure out what side to pin it on now…

The way this pattern is written, the odd number rows are the RS rows. Since you’ve just finished row 3, that was a RS row. The row you’re about to start now is a WS row.
Yes, a marker or a safety pin on the RS is a good reminder.
Enjoy your project.