I plan on buying a plan B due to an encounter last night just to be on the safe side as I was in the first day of my fertile period according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>. Some of the reviews say it can throw the cycle off.

How long does the cycle stay off or is it permanent, and if it’s not, are there ways to force it back into its regularly scheduled programming?

Update

Thanks for the replies. I was on antibiotics and steroids at the beginning of the year and they didn’t screw with my cycle like they apparently could have, so you’re right, it’ll do what it wants, which due to the precedents seems like that means that it might not get thrown off at all but only time will tell