i had my last period on the 26th of april & they started on the 20th on from the 3rd of may my partner  and  had sex now i started having pains like period pain i wake up with nausea my back aches slipperish creamish fluids are comin out of my vagina it doesnt smell but i dont like my doctor said i could be pregnant and shld do preg tests but he also said i could be infected and have to take antibiotics. so my question is are these preg sypmtoms i am having and why so early its only 5 days after i had sex with my partner?