14w - brown discharge a day after sex

I accidentally posted this in my birth month group, and meant to post here!

I am 14w tomorrow and had brown and yellow discharge today after straining to use the bathroom. No blood on panties or in toilet.

My husband and I had sex yesterday, which didn’t hurt but did feel a little uncomfortable, and I did orgasm. It’s only the third time we’ve had sex since I found out I was pregnant.

I also attended a particularly strenuous, but not dangerous or new for me, SoulCycle class yesterday. I didn’t notice any brown discharge until I wiped after using the bathroom this morning.

I have zero cramps and have had 3 perfect scans, including my NT scan 10 days ago, and great NIPT results.

Should I be concerned? Does this happen to anyone else.