scared/depressed!!!

Im 3weeks late from my period...
Took a preg test and it came out negative...
Im freaking out!!!
What else could it be!?
This has never happened to me before,
I noticed that during sex it hurts a little...
Im so scared that its a cyst...cervical cancer should i worry,go for another pregnancy test?!?...
Ive been crying my eyes out thinking the worst,i have four kids and i know how it feels to be pregnant,and im not feeling that at all!! So i know it cant be that...