Cycle issues??

Cycle day 41 I’ve had no positive ovulation tests I gave up doing my bbt because it’s stayed low so haven’t done it for over a week and I still haven’t got my period! No signs of it coming either I usually start my period by day 35 but I just have no idea what’s going on, I’ve taken a pregnancy test and that is negative too. Can’t get a doctors appointment either so I really don’t know what to do. Been trying for about 15 months and never had a cycle like this. Has anyone else had a cycle like this, how long did it last etc? Any advice would be much appreciated.