My apartment smells like skunk!!

I wasn’t sure where to put this. Yesterday morning I was walking through my dining room and something stunk really bad. I assumed maybe my dog pooped in the house so I looked every where for poop but couldn’t find any. I went to my bedroom and my SO asked if I smelt that. We couldn’t determine what the smell was so we dismissed it. Late last night the AC kicked on and we smelled it again, it was like a whiff of skunk. My SO turned the AC off and the smell went away. Of course I went to google and the first thing that comes up is gas leak. So instantly I’m stressed out and we pack up all of our stuff and go to my MIL. (We have a 3 month old baby so if it was a gas leak I didn’t want to risk her being around that). Well I came back to the apartment this morning to clean up before calling our landlady to come fix the problem. I decided to turn on the AC again and see if I could smell it but I couldn’t. My stepdad had mentioned that he wondered if it was a gas leak or one of our neighbors smoking pot. So I decided to look it up and it says pot can smell like skunk. So I’m honestly at the point where I don’t know what it could be. Any ideas?? The smell is not constant. And it would not be a surprise to me if one of my neighbors are smoking pot.