Can you know ur pregnant 2-4 days after sex?feeling weird and sick.....

so i had unprotected sex 3 days ago and today i had unprotected sex again, I don't know if it's possible to feel pregnant or whatever but i feel like throwing up and my stomache hurts... i feel tired.. My left boob is sore only it's so weird... do you think its possible or there's no way yet?..... ugh i don't feel good.. i want to throw up all over the place but yet my stomache is growling .....