I’ve been feeling weird lately

So TMI, obvi, i just finished my period a couple of days ago. and two days before my period ended, i started feeling nauseous, but only two times at night. the first time, i was sitting in a hot bath, and i assumes that’s what caused it because it’s now i normally react taking a bath with my boyfriend. the second time it was later and my boyfriend’s mother had just made popcorn and the smell of it made me sick until it was gone (or i was immune i guess). every day since then, at random times at night, even after my period has ended, i’ve been feeling nauseous at night. i felt this way the last time i was pregnant, but i’m afraid to get my hopes up. i took a test, but i knew it was way too early because my period had just ended. any ideas?