Frustrated by this app...

So.. I have not had a period in a long time. In the last ten or so years, I have been either breast feeding or pregnant, and breast feeding is a very  effective birth control for me. 
I know this is mostly a period tracking app but I like to track my moods and cervical mucus, etc, to know when my fertility is coming back. But I cannot do this. It's telling me that my period started today and I can't convince it otherwise.. Please help! 
I was able to move it and shrink it but not delete it.