Taking Inofolic sachets and spotting

Hi everyone! I'm pretty new to taking Inofolic regularly (12 hours apart). I haven't been regular with taking it before, so I was surprised to see that I am spotting dark blood during my ovulation. I am also taking birthcontrol if that matters.

I guess I am looking for advice/similiar experiences from anyone. It would be much appreciated. Is this normal? I don't experience any new pain or discomfort.

For reference, I am in Eastern Europe, and my Inofolic comes in sachets, contains myo-inositol, alpha-lactalbumin and folic acid.

Thanks in advance!