Brown Discharge after Cervix Check

TMI ~I’m just worried but picture is kinda gross~

I got my cervix checked this morning at like 8am and then at 1 felt like I passed a clot (like when you have your period) and found this in my underwear. Im 39 weeks tomorrow. Is this normal?? Nurse said I could have spotting but idk if this is the same. I don’t have anything else when I wipe either. (Also. Idk if that’s pee or what 😅 how do I check if it’s amniotic fluid?)