spotting or early af?

I started spotting yesterday. period is not due for 6 more days. this is today. I am confused because It is not heavy enough to be a period. am I just starting early? I was at Disney and seaworld so I wonder if my body is stressed and trying to start it earlier. the only thing that is different is I have started taking prenatal gummys to ttc. we've only had sex once this month so I don't think it's a bfp kinda deal. help?