Brown discharge in early stages of pregnancy

Good Morning!

Question: This is my first pregnancy. I am about 4 weeks pregnant. I never started a period and I had a positive test two days ago. A day after the positive test I started noticing brown mostly light but sometimes a tad bit darker blood/discharge. It is only when I wipe after using the restroom. I don’t have it in my underwear. It’s light as well. Anyone else ever experienced this? And lastly, a miscarriage would be very obvious as in bleeding and red, right?! So I would know if that happens?!

Thanks,

First time Mom