Late period? Anxiety

I'm expecting my period last May 4 and I've been experiencing cramps and low and middle back pains this week.. I also experienced some kind of brown stringy discharge four days ago (pic below)

I'm anxious because I am already two days late and I don't know how to track ovulation (Last time I had intercourse was December)

There's no way to get pregnant if there was no penetration right?

I just need assurance because I don't want to further delay my period due to stress..