bfp at 7dpo?

i tested due to pregnancy symptoms going on for a few weeks now and was getting negatives prior. has anybody else gotten a BFP at 7DPO? walmart cheapies) is 7dpo 8 days from af. (frer digital & frer rapid) is today 8DPO 7days from af. i’m definitely pregnant but didn’t think it is possible to find out this early especially getting a positive on a rapid that requires a higher level of hormones. any suggestions on possibilities? i wasn’t tracking ovulation or temping.