Tracking BBT after Emergency Contraception

[Camellia12]

Hi everyone! For family planning purposes, I track my basal body temperature each morning and use the Natural Cycles application. Recently, I misjudged my fertile days and decided to take emergency contraception (morning after pill) after unprotected sex (no ejaculation, but still concerned about pre-ejaculate). I have searched high and low online for information regarding how the morning after pill will impact my BBT. Because the pill is composed of levonorgestrel, which mimics progesterone, I would have expected my BBT to rise after taking it (which did in fact happen). I have had elevated temps since taking the pill about 8 days ago, much much earlier than forecasted ovulation and luteal phase in my app. However, I cannot find any information or confirmation that levonorgestrel will increase BBT. I have emailed customer support at Natural Cycles to find out more, as I would expect the app to explain what could happen after taking BBT (they are vague). Would anyone have information about this? Thanks!

Hopefully someone will be along with advice very soon, OP.

Thank you, @LouMumsnet!

Customer support at Natural Cycles did confirm that levonorgestrel does have an impact on BBT, but of course for each individual the time period may vary. It seems that BBT may increase after ingesting the pill for a period of 2-5 days. If temperatures remain elevated beyond that time, then it is likely that one ovulated at some point after taking the pill (or that one may indeed be pregnant).

I'm disappointed that there is so little information available about this online!

I realise this is an old thread but I had question too, and your thread is basically all I could find! Thanks for sharing. Since taking it my temperature did indeed go up for 2 days then dropped along with an early light bleed, then back up for a couple of days, the down for 3 days, then up... basically it went mad and no idea where I am in my cycle!

Also, I hope it all worked out for you!

@Camellia12 and @xtinak, thank you for sharing! I'm in a similar situation and again this thread is all I could find, but it makes me feel better that I'm seeing what may be a normal raised temperature so far.