Before pregnancy test.

Mallory
Okay it's only been a few days since me and my fiancé had sex but I've been having some symtoms. I've looked at so much stuff online that says you can start having symtoms as soon as the next day and then some stuff that says it takes a few weeks. I don't know what to believe. I've been really tired all the time, my boobs have been so sore, been so hungry all the time, had some small cramps, and had the pee so much more than usual. 
Can someone help me out?