Hello, my girlfriend has been on tricyclin lo for the past year. She takes it faithfully every day. Everytime we have sex I also use a condom. I never ejaculate inside of her. She recieved her period on the correct day of the month, although she usually gets it in the morning, and this time it came during the early evening. I repeate she did not miss her period. During her period, which was normal flow, and color, she started to have weird stomach pains low on her one hip, and head aches and body aches. I got scared and made her take two pregnancy tests on the same day, and it was the last day of her period. They came back negative. She took one 3 days later for me and it was negative, one a week later and it was negative and then one 2 weeks later and it was negative. She is due for her period again on tuesday. Is there still any chance of her being pregnant? Please help!