Hi. I Lost My Virginity On December 10th, And We

Hi. I lost my virginity on December 10th, and we used a condom. We have had sex since then but have always used a condom. I am now almost three weeks late for my period, and have been very stressed out due to thinking I am pregnant. I went to the doctor on the 21st for a UTI and they tested me and the pregnancy test came back negative, and since then I have taken 6 more tests and all are negative. I have never been this late before. I have noticed that I have a LOT of clear watery discharge that makes me think my period is starting, cramps, upset stomach, etc. Am I pregnant with false negatives? I am really worried!