10 DPO but negative Test

Okay. I need some help. My husband and I miscarried in January. I found out at 9/10 dpo with that one. Well I could have sworn I was pregnant this month, but I got a BFN on a FRER and an internet cheapie. Has anyone gotten a stark negative at 10 dpo but then got a positive a few days later? Or even that night? These past two months have been stressful with teaching online and my cycle is off by about 5 days, but I am fairly certain of the day I ovulated. HELP PLEASE.