How long does it take for the line to get darker

So I stupidly tested early. Like way early. I’m not due for my period until Sunday but tested Wednesday and this morning. I got 3 faint positives but you can see them and has pink to it. But the one from last night and this morning look the same. 😩 I just want to see it get darker. After having a miscarriage in December I’m praying so hard this is our 🌈 rainbow! Now I’m worried of a chemical 🥺