Am I pregnant or just an irregular period?

So I’m now three days late on my period on my second day I wiped and it was pink like really pink and only happened twice when I went to the bathroom, but got lighter the second time. Nothing in my underwear only when I wiped and I’m positive it’s not a uti. If my period doesn’t start soon when should I take a pregnancy test? Also if this had anything to do with it I’ve been very tired and sleeping a little more then usual. I do have mild cramps that only happen like 4 times a day and my boobs are very tender I thought it was maybe just because my period is coming.. but it hasn’t.