I have been using this app for 3 years and it was spot on with baby 2 and 3. But this month it said my fertile week would be from Tuesday the week before last to this last Monday. But yesterday the 14th I had period type cramps all day and lower back ache and this morning the 15th I had stretchy egg white cm?! My husband and I had sex yesterday morning.... today we are so busy it won't happen. What is going on? Is my week off or is there a chance that this stretchy egg white cm isn't fertile? So lost...