What does morning sickness feel and look like?

Sasha • Been together 6 years ttc our first! ❤️
I was sick twice after eating something at the cinema and I keep feeling like I have mild travel sickness, it started around a week and a half ago, I wasn't actually sick but I kept having a sick feeling and a twinges in my lower left side of my abdomen along side these (pics) symptoms and today I was actually sick twice and felt sick the whole day... I've tested twice last week but I keep getting a negative result... My period is due in 2 days but currently no other symptoms have occurred that would relate to a period... I also don't feel hungry (maybe due to the sick feeling) how early can you get morning sickness without getting a positive result??