last period is 8-10-07, no mens until now, have several pregnancy test and its say negative. we have sex in that period. On oct. 15 my UTZ says im not pregnant and have thin endometrium . Last Sat. have TUV and says I'm not pregnant, but have thickened endometrium, im worried im 46 years old na and i dont want to be pregnant na. Is it possible that i might be pregnant. i have large breast and pain in lower back. please give answer