On cycle day 77 and getting frustrated!

My cycles have never been normal, but this has never happened. Im heartbroken and losing hope of ever seeing those 2 beautiful lines again. My husband and I had a miscarriage in Jan and my cycles have been totally off. Worse than normal. Im at my wits end trying to figure out when Im ovulating -no, Im not checking my bbt. Yet. But I have a thermometer ordered so Im hoping to get started very soon. Any suggestions at this point would be very much appreciated!  Baby dust and lots of luck to those in the same boat!!