The basal body temperature rose suddenly after only 3 days, and going to the toilet in the middle of

Every time I have menstruation 5 days earlier than the previous month, I have never measured the basal body temperature before, these months I want to have a baby and start measuring the basal body temperature, the first month down, the high temperature period is measured, but it is only a few days down, according to the standard after ovulation, the high temperature period should last 2 weeks, I am not even full of a week, fainted, now it seems, probably my luteal function is not good, the menstrual cycle is shorter than others.