Dark lines but light pink bleeding

Ashley

My period was due Tuesday but I started spotting Monday. At first it was brown and extremely light. Over the last 48 hours it has become light pink and a little more but still not heavy. I got my first positive 12/4 and the line has gotten darker. This was a test from yesterday. I’m extremely confused. Anyone have anything similar and still had a healthy pregnancy? I’ve had a chemical before and the lines never got dark at all. And my other two healthy pregnancies I didn’t have any bleeding. Everything I’m reading the lines tend to get lighter or are never as dark as my tests.