Anyone? early internal scan?

💗louise💗 UK • Mummy to 1 prince and 2 princesses 💙💗💗 pregnant with our 4th little one our 2nd boy 🥰💙👶🏻 due January 2020
Hi, has anyone had an internal scan around 5 weeks pregnant and then had some brown discharge after? 
I had an early scan yesterday at 5 weeks 1 day and when I got home after a couple of hours had some old blood/brown discharge! Is this quite common? xx