Vomiting up to 5 times every time I eat 🤢🤢

Hi girls just needing your advice, I had unprotected sex the first day of my window.

And since 8 dpo I have been vomiting up to 5 times after every time I eat or drink.

However I'm not really nauseous all other times only when I eat, I can't see to keep anything down! This has been going on for over a week now.

I have taken a test and it was negative however it could have been too early.

My question is can morning sickness hit this fast if I am pregnant or is it more likely a tummy bug? Please help 💕