Please help

Demi • Girl mama 💕 Harper 8 and years Lucille 4 years Artemis 1 years

Hey all, im really worried.

I have taken a test at 13 DPO 14DPO (with a positive digital) and 15DPO and my 15DPO (today) is slighly lighter then 14DPO. Im roughly 4 weeks. Could this be because im early? Ive misscarried before so im really worried! Thankyou