Need help ugh dk what to do or think.?

Ok so the last question i asked may have lacked detail. I had a period December 2nd im thinkin it was a real period but i had sex about 3 times through out december after that as well. Here it is January 6th and i have not recieved another period. I took a pregnancy test on January 4th or 2 days after my missed period. It read Not pregnant. Usually when my nerves start up and i think im pregnant i get the symptoms like sore and darkened and heavy breast. and headaches and nasuea and major acid reflex. And ill miss my period this has happened 2 other times before and i took a test and it read Negative and my period came that night because my nerves went away i thought that is what might have happened with this time but here it is 2 days after taking the test and still no period and still tons of symptoms. Im EXTRA tired and crazy cranky and confused and i dont know what to think i need all the opinions i can get. if there nice anyways. ThanKs people of Yahoo.