What Causes Nausea,headache And White Discharge After Having Unsafe Sex?

hi, my husband and i just started having unprotected sex as we want to try and conceive :) ... my last period was dec 24th 2014 and im on a 28-29 day cycle. the first time we had unprotected sex was january 1st 2015 and then again on the 7th and 11th of january. for about a week now, i have been feeling weird, nauseous headaches and mild pms cramping. on january 6 i got egg white like discharge. could these just be weird symptoms or could this actually be early signs of pregnancy. should i test this weekend? my period is due january 21st, or wait to see if i miss my period?