So my cycles are long, average 55 days. Been TTC and using Glow for two cycles now. Glow has always predicted that my next period would begin April 2 but today it was suddenly pushed out 2 weeks more!? I'm having to do the TWW all over again and my BD is all messed up because my fertile days from 2 weeks ago changed as well. Why did this happen so suddenly!? I didn't do anything different.