I'm 22 years old and possibly my frist pregnancy I love to learn things and get as much information as I possible can about my situation please I need some help if u can

Can a test be positive one day and later be negitive

Jus found out i jus threw away a positive pregnant test last week thursday im so freaking stupid

Jus made som raman noodles with soy sauce and lasgna flavored cheese stuff im eating stuff i normaly dont hunger for so crazy weird

Used to lay on my stomach but now its hard to get comfortable cause my back hirts and my stomach

Ive been throwing up two days straight been having a white dicharge for five days havent still waiting to see if i have a missed period need some questions answered please