I'm so confused!!!

Mariah
Last Friday Jan 15 I had morning sickness. Lasted 2 hours dihheria and threw up once. Took a test Saturday and it was negative. Then Thursday Jan 21 same thing. Woke up dihheria and threw up once. Lasted alittle longer about 4-5 hours. Took s test that night negative. And again today the 22 with FMU and negative. And then today I'm fine again. Everyone keeps saying its morning sickness and asking if my pregnant but I have had 3 negatives!!!! Did anyone else get symptoms before a positive on test!! What else could be making me sick in the mornings for only a few hours and only here and there??