BFP?!

Jordyn
Hi there! So my most fertile day was Oct. 18, and my husband and I BD that whole week, I had on and off symptoms until I tested at 13 DPO with a clear blue digi, which was negative. Period is late by three days and now this with FMU. can you trust just one of these tests? Is this for surey BFP?! Should I test again in a few days?