Consistent interval, different onot
17 August, 2011
The last 4 months I have gotten my period on a Thursday –– and each time they were exactly 4 weeks apart. However, sometimes the period started during the night (like 5 am) and sometimes in the morning after sunrise. Is this considered a kavua period, where I need to keep this interval for 3 months? Or is it only month by month? Thank you.
Since your period did not consistently start in the same onah (either day or night), you have not established a veset kavua. You should still calculate your usual onot (yom hachodesh, haflagah, onah beinonit) based on your most recent period.
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