scared rainbow momma

Ca
My husband and I just had sex, and when I went to the bathroom there was light brown on the toilet paper. I wiped again and more. It was kind of thick. Of course I'm freaking out. I have a home fetaldoppler which I used and found my baby's heart beat 166-170beats per minute. So all sounds well. But this scares me. Should I be concerned ?? Is it normal? 😩