TMI , No pic. Urgent question

Two days back when I pee, I noticed a small black pepper like thing settled in the bowl.So I thought may be it was already there in flush water and ignored. Today this happened again in a different bathroom. Which makes me wonder could that tiny black think be actually coming from inside me? I am 12 weeks exactly.No spotting or cramping or bleeding.Clear pee. I took UTI antibiotics about a week ago. Anyone who can tell me, what's going on? Do you think I should go urgent care?