Could it be??

So I am late for my period, depending on the app anywhere between 1 to 5 days late. I ovulated on December 28th, so that would be put me at 18 dpo. On Friday night, I had a little tinge of red on the paper and expected my period to start the next day as it has done in the past but nothing. Now yesterday and today, I have a little bit of a reddish tint left on my panty liner in between bathroom breaks but nothing when I wipe. I have been waiting to take a test and plan on it tomorrow morning. I am just wondering if this has happened to anyone and you were pregnant? I haven’t felt any cramps which I usually would have and I am also trying not to get my hopes up, but it’s weird that I have very very slight bleeding/spotting