Is my snake acting normally? im confused

[NewSAHSnakeMom]

OK so I am new to snake ownership and I've been getting mixed info online. Its an unsexed Sinaloan he's active mostly at night, unless he's moving under the substrate where I can't see it. I think its still young. Idk the pet store didn't know much. I would post pics but I still haven't figured it out. I'm technologically impaired. I could email them that's about the basics of my ability. Lmao! I did manage to put my snake as my profile pic. The snake hides a lot except late at night. I've had it 6 days and no pooping has occurred yet. Not that I've dug too far in the substrate, I'm still nervous. Its not my snake really I'm just the researcher. The snake is my daughter's and my husband does the handling. So any help would be appreciated.