I had one 6w6d nhs with my previous pregnancy under the early pregnancy unit and I could so you definitely should :)
I would say as it’s external it could depend on your weight, if you’re slim they shouldn’t have an issue at nearly 8 weeks. For example I’m too fat and they’d struggle 🤣. They would find it internally no problem
I’d say yes at nearly 8 weeks ☺️ Baby will still look like a jelly bean until closer to 12 weeks