i think that is normal. If new growth is looking good I believe you're on the right track. But others may weigh in with different and more experienced opinions.
Before I really knew what I was doing I used to snip those off after I got my second node. Kinda stupid looking back now but it never really stunted growth. You'll be fine
yeah, those embryonic leaves fall off when your plant gets bigger. No big, it's natural. I didn't know what to think when mine started doing that lol. It's my first grow too.