Spotting

I’m 6 weeks pregnant and I had sex like 3 days ago and after that I started spotting brown blood it would only happen when I would wipe . The next day it happen again I called my advice nurse and she said it was normal . I had sex the next day and same thing but more I had a lot of brown blood I got scared and went to the ER . They took some blood work and did a vaginal ultrasound and I finally got to see the baby it was really small but we finally saw it . They told me it was old blood and it usually happens in the first month they said as long as it’s not bright red not to worry about it . I keep spotting and it happens more when I go to the bathroom to poo I had a lil bit of brown clot today has it happen to anyone I’m still kinda worried ?