I never got on with OPKs, I never got a positive as I think I peak really quickly and they just stressed me out but have got pregnant 3 times with BBT. November 2013. Anyone willing to check my chart out and give me advice maybe? Is it possible to be pregnant with no increase in bbt? Cramping few days after Implantation? Here is an example of a chart without pregnancy with a decrease in BBT on the day before the start of a new cycle: The normal basal body temperature drops before menstruation in 1-2 days on the basal body temperature chart. In normal circumstances (and without a pregnancy) BBT will stay … In a typical, healthy menstrual cycle, your BBT will occur in a specific pattern. And it went back up only in line with my other temps. It can be affected by many internal and external factors. BBT experts: Peak OPK but no What is Basal Body Temperature (BBT) in early pregnancy Fertile Cervical Mucus