What is the ideal period for menstrual cycles?

I've had 4 negative home pregnancy tests and one in the clinic. What other reasons might my period be so late? Does this mean I did not ovulate this month?

If a pendulum has a frequency of 1.37 Hz (that is, 1.37 cycles/sec) what is the period of the pendulum's oscillation? I cant seem to find anything that helps me answer this ...show more

I went to the crisis pregnancy centers and they did the urine test and that was negative 2 and a half weeks ago still no period my last period was the end of april its now july so any advice

is it normal that my period cycle went from a 32 day cycle to a 50 day cycle 5 months after implanon was removed?

After posting my last question, I found out I was in fact, pregnant. According to women's health site, it stated that I conceived 3 days after my period ended. My husband & I are Catholic & don't use any contraceptives other than abstinence and...

I'll be having a hysterectomy soon. I'll be retaining my ovaries. I'm looking for apps or sites that help to track hormonal cycles that *don't* depend on the date of menses to predict PMS. Thus far in life, I've been able to predict pre-menstrual moodiness...