Positive OPKs days apart?

Mariah • 23. Wife. MMC 11/12 ❤ TTC#1
Hey everyone!
So I got a solid smiley on the 13 (Thursday) 
Then yesterday I noticed a spot of brownish red in my underwear. Very small. Then at night I had some cramping. I decided the cramping was probably bc I was running around chasing my dog. So then today I still had some mild cramping. When I got home, I noticed another spot in my underwear. I took another ovulation test (cheapie strip) and it came back positive. I am so confused?! 
Has anyone experienced this before?
What r ur thoughts?
Thanks!