I am having so many pregnancy symptoms, sore nipples, larger boobs, and more

I had sex a little over 3 weeks ago about a week and a half after having sex i noticed that my boobs had literally grown over a cup size and were incredibly sore. A little after that i started getting nauseous and since i have thrown up everything I have eaten a while after i eat. My nipples have changed and stay erect and are sore. My stomach feels upset. and in the last two days I have noticed my self peeing a bit more often.  I am also 5 days late on my period as of tomorrow, and i have had some slight cramping like im going to start but i didnt accompanied with some lower back ache. On the first day of my missed period I took a pregnancy test but it was negative, i am also fairly tired. I feel as if i have so many signs of pregnancy but i need help i dont know if that is what this is or if it is something else. Can someone give me answers or help me feel not crazy... i thought after i saw the negative on the test that maybe it was in my head and the symptoms would go away but they havent. PLEASE ANSWER, PLEASE IT WOULD BE MUCH APPRECIATED