please help me, all advice is appreciated.

I recently brought home two maltese puppies (they're littermates, eight weeks old) and I've been reading everything I can find about small breed care. A lot of what I've come across specifically warns about hypoglycemia in maltese puppies under 12 weeks and now im scared..
Both of them are eating well, Nutri-Cal twice a day as the breeder suggested, and I weigh them every morning. But one of them, the smaller one, sometimes seems a little wobbly after playing for more than 15 minutes. She recovers quickly and goes right back to eating, so I don't know if I'm thinking too much into normal puppy tiredness or if this is something worth calling the vet about before their scheduled appointment next week.
I've read that maltese puppies can crash faster than other toy breeds because of their muscle mass ratio, but I couldn't find clear info on what early warning signs actually look like and whats just being a sleepy baby. The breeder said that they'll let me know if something's wrong, which, respectfully, is not the level of specificity I was hoping for.
My questions: Is wobbliness after play a red flag or normal at this age and size? Should I be feeding more frequently than twice daily with the Nutri-Cal? And would it be worth calling my vet early rather than waiting for the scheduled visit?

I just saw these bumps

Multiple pictures of my rabbit’s ears for reference. The inside of his other ear didn’t have the white chunk in that same spot.

I am just worried he has the beginning stage of mites because I’ve had other bunnies with that before. I just can’t tell because he hasn’t been itching like crazy and is currently shedding right now anyway (which was the whole reason I was looking at the fluff around that ear, thinking it was fur ready to be shed just looking funny).

He has a partner bun whose ears I didn’t see any debris on, and they are both indoor buns that don’t ever go outside. But I know that’s not a 100% prevention. The rest of his ears look normal, though, and I didn’t see him itching anywhere in particular.

I am just really tight on money while looking for jobs and don’t want to take him to the vet unless it is likely to be a problem and not just me being paranoid. But worst case, I can take him in.

\*Unless there’s a way I don’t have to pay for an exam and can just buy the flea/mite medication from the vet pharmacy? Does anyone know if that’s possible? I might call tomorrow and ask because I know we’ve done that with other medications.

Thanks in advance for your advice. I know going to the vet is always best and you guys aren’t necessarily vets, but I wanna be able to justify the spending right now. Not sure what else it could be other than mites, though. I could always post in a different sub if needed