Hey, need some help with ghusl intention...

Salam everyone. I've got a question about performing ghusl. So, I only wash my hair once a week because it’s a hassle, and I always blow dry it after. I was at the end of my period and had the intention earlier in the day to make ghusl when I showered. I went ahead with my shower, blow dried my hair, and then settled down. That’s when it hit me-I forgot to specifically make the niyyah for ghusl when I actually started the shower, even though I’d intended to do it earlier. Do I really have to go through the whole two-hour process again, or is my earlier intention enough? What are your thoughts on this? JazakAllah khair!