14 DPO preg test positive!

MC 🌈

I took Clearblue that clearly says I’m pregnant. But first response line is very very faint. Has anyone else had trouble with first response testing? I just need some reassurance, because I feel like the line is more faint then yesterday (not pictured) ....I’m afraid of having miscarriage 😱, because I’m 39yr old and this is my first positive test.