Cant adjust period length

Im very unhappy with this app. I liked it at first. However, in three months post partum and just got on birth control a few weeks ago. This has caused me to have a longer period than normal. Im on day 16 and the app wont let me say so; it says "sure? Usually less than 16." Yes, Im sure! But it wont let me change it beyond 15 days. Nor can I say Ive started a new period today. Its very annoying and I will now discontinue using it.

BP411 about Cycles: Period & Cycle Tracker, v3.1.2