Pregnant or period coming?

I have had a bit of creamy brown cm/discharge today and yesterday. Only when wiping and not every time.... I had put a tampon in yesterday because I though af was starting and when I took it out...nothing. Same thing today. Put one in this morning and when I went to switch it this afternoon it just had some brownish cm on it, no blood. Period is due to start today. This would be cycle day 29.

Just my period starting or could it be a sign of pregnancy?