My husband, 38 and i, 34 are planning to have another baby. I'm taking ocp. How long should I wait after I stop ocp to try and pregnant?

1-2 months. 1 month is probably enough, 2 months is plenty. Be sure you are taking 400 mcg of Folic Acid daily for at least 2 months before conception to lower the risk of spina bifida, a common and very serious birth defect.
3 months. 3 months is ideal. Generally wait a month. And if it happens sooner, congratulations.