Possible very faint positive!?!

Elizabeth • I`m 23 I have one beautiful son Miguel and a sweet baby Lena. Married 6 years and done with having kids.
​ I got this very faint line yesterday on a FRER. It was not FMU. It's barely there and could be an evap. AF is due 3/12 and I am 10dpo today. When should I retest? I only have one FRER left.