By a very small amount but you would only know this if you were keeping a detailed chart of your basal body temperature. You'd need the chart to see the ups and downs of what your BBT does daily, weekly, monthly, etc.

You have taken very heavy doses of hormones recently with the plan b and the birth control. Your body is going to be thrown out of whack.

That said, IF you miss your period, take a pregnancy test but trust it if is says NEGATIVE (and it will). Your period may be missing beause of the hormones you've taken.