Poolish

I am a beginner....! Thursday night I made a poolish so I could bake my first bread on Friday, leaving it out overnight. It turns out I cannot bake the bread until today (Saturday)...so I put the poolish in the refrigerator. It doesn't look the same anymore and is watery underneath the surface. Should I start over again, or can this be used. Sorry for the novice request! But I have my my shirtsleeves rolled up and ready to rock!