Negative or...?

Shelby • Mama. 2 girls 💕 2 boys 💙 engaged to the love of my life 🥰

I’m 12/13 DPO (got a positive OPK on 4/19 and 4/20 so I’m not sure exactly when I ovulated) That was my first time using OPKs. I’ve had some cramping, some heaviness/“pulling”, a touch of nausea but nothing crazy but my heartburn has been 10x worse than it normally is. Am I seeing things? Or does anyone else see a very faint line?