Last thing, then I’ll leave you to your decision to wait another month before vetting.
Internal parasites are unlikely to be seen. Roundworms are really the only ones that can be seen, and that’s when they’ve reached maturity, and they look like spaghetti noodles. I’ve had a foster pup that the shelter said was wormed, and didn’t need it for another 2 weeks. 2 days later, I woke to a bloody crate and a panicked puppy. His worm load was so heavy, he ended up with a anal prolapse. His intestines were literally hanging about 8 inches out of his rear. To the emergency vet 1 1/2 hours away. They reinserted the intestines, and showed up how to do the same. When the regular vet opened, we called to schedule surgery. Every time he pooped, he pooped out intestines, and we would have to reinsert until he went into surgery.
Not saying that’s going to happen to your pup, but no one but a vet with proper equipment can see the internal parasites, they are invisible to the naked eye.
Going potty inside the house?!?! For a month?!? I don’t envy you trying to retrain the pup that potty inside is off limits. Some of those parasites I was talking about? Those can infect a human via pet transference. You’re increasing your risk, as well as the pup, by letting him potty inside.
I’m sorry, but it seems like you are putting your fears onto your puppy, and not taking actual responsibility for him. You need to get over the “what if’s” and vet your dog.