Dark brown booger like discharge

AAV

Hi ladies, today I am 5w 3 days pregnant asper the app. When I went to pee, there was dark brown booger like stuff on the tissue. Don't know what this was as there is no discharge in my underpants. I've conceived thru

<a href="https://glowing.com/glow-fertility-program">IVF</a>

and my first scan is on 19th feb... I'm worried. Any insights will help