Should I take Plan B?

CD 15, I've been feeling left sided pain for the last 3 days, all my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> say I should ovulate in 4-5 days but I've been ovulating on the 7th based on cm and one sided cramping. We had sex today (3x) but he pulled out, should I take Plan B? I know it can really mess up your cycle.. Please no rude comments, I have an appointment made for birth control.

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