Hello, I am a little concerned. I had sex with my boyfriend on January 13th. My period before that began on the 31st of December. The one before that started on the first of December. I began taking Pueraria Mirifica pills sometime in December because I want to increase the fullness of my breasts from previous breast-feeding. They are working as I have a bit more fullness and weight in my breasts and I am beginning to see less loose skin on my breasts when I raise my arms. It is now the 5th of February and I have not had my period. I know the pills can cause a period to start, as I read testimonial by a 52 year old woman who had her cycle begin again while on the pills. But I also read they can delay the menstrual cycle. I have minor cramps now in the area that is the center of my abdomen, and they are unlike the cramping I normally have. I usually have major discomfort in my lower back, lots of discharge, weight gain , major irritability and intense hunger, but none of these things have happened. There is minor discomfort in the center of my abdomen. My breasts are more full but I believe it it an effect fo the pills. I have had absolutely no pain in my lower back, bloating , or uncontrollable apetite. I have had much more frequency in urination , sleepiness, weakness, some minor depression/spaciness. I have taken 4 pregnancy tests (two of them before days before the first of February, and two yesterday) and they were all negative. The two yesterday showed negative almost immediately. Yesterday marked about the 21st day since I had unprotected sex so I took a test but it was negative. Could it be too early for the tests to detect the hormone? Should I wait another week and test again? Could the pills effect things this much? What role does estrogen play in menstruation? Can higher level of it cause a false negative?