My gf had her last period on May 4th. She isn\'t on the pill, but we used spermicidally lubricated condoms and had no accidents. She is now 9 or so days late, but took two EPT\'s that were both negative. She did have a yeast infection and possible urinary tract infection in the last month that she took pills for. Could she be pregnant or did the medicine affect her period? Is it possible she just missed a period?