Pregnant??

Lisabet
I hate these kinds of posts but I guess it's my turn to ask...
I am 3 DPO  we had sex three times while I was ovulating. 
I've been experiencing cramps, dizziness, some nausea, SLIGHT tender boobs, fatigue, constipation but when I actually poop it's loose, and hungry all the time. But when ever I eat I feel like Ima throw up.. I can think of something that I want to eat then start getting naseous after a few bites.
I'm suppose to start my period on the 18th. 
Is it too early to take a test? 
Do you guys thinks I'm pregnant? 
Please let me know! Thanks!!