I used to have irregular periods (I had as few as three in a year) but once i started taking bc they became extremely regular. Pleasantly
light, lasting only five days, and every 24 days. Due to some kind
of shipping error, one of my shipments arrived a month late- so late that my next shipment arrived only a month later, so I has six months' worth of bc arrive within a single month. Scumbag pharmacy much?
My last period started January 24, and I haven't had once since then.