Help! Glow changed my dates!?!?

So originally Glow predicted O on the 20th and the preceding 5 days with AF due 6/2, but since entering my temperature it has thrown it out and pushed it further by a whole week!! Unfortunately if glow is correct our chances of BFP this month are slim to none because of my shift work :( I am starting to wonder if I am actually ovulating or if I have a very short LP!? Anyone have some advice ??? My cycles have almost always been about 32-36 days long, but glow is now saying 42!