Implantation bleeding or is my period coming early?

So I wiped and got this tonight and only when I wipe nothing on my underwear. My husband and I haven’t really been tracking ovulation this month as we got referred to a fertility specialist finally. So I’m not exactly sure when I ovulated but I had a little cramping in the beginning of the week like Monday so I’m guessing around then possibly. And my cycle lengths vary so I’m guessing I would be starting in about a week or so. I have also been having some cramping today as well. Period or implantation bleeding?