Am I out this month ?? Please help

Jennifer
Ok I have been TTC for 10 months now and no luck. Some months my period is late but it will eventually show. Each month I'm disappointed by negative pregnancy tests. I tried preg prep this month as directed and my period is late 6 days but I am still getting negative preg tests. About 1 week ago I had increase in body temp back aches headache nausea for one evening and night but the next day I was totally fine. I thought maybe that was implantation symptoms as I read those are common with implantation but I still have no AF and no HPT. 😒