16w 2d and saw blood !! Tmi??

Freaking out. Called my dr. She said it could be from intercourse yesterday. But I'll be honest I was feeling baby everyday for about a week and the last two days I haven't... The blood is pinkish & brown.. It seemed like a lot and I haven't bled with my last pregnancy 4 years ago OR this one so far. Please tell me this has happened to someone else and everything was okay!! I need reassurance.