Hi Fran, so sorry for the delay in responding to your question! I was away for a few weeks. As long as your starter is responding well, with no more signs of mold, it should be fine to use. Try to feed your starter when it's at its highest point of rising, or just beginning to fall, which will keep yeast activity vigorous. Allowing the starter to fall significantly between feedings tends to lead to sluggish yeast. In warmer months, this may mean adding another feeding to your routine when your starter is stored at room temperature. 

I hope this helps! Let us know how it goes. 

Barb

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