Teeny tiny brown spot


I guess I just need to hear from others that this is normal. I’m 18 weeks and everything has been going perfectly. No spotting, no scares. But today I was walking around a park with my sister and when I went to the bathroom I wiped and there was a teeny tiny brown clot like thing in my undies. It was the size of like an ant lol. Anyone else experience this? I guess I just need to know not to freak out over nothing.