Was your water clear before you shocked? I used to use cal-hypo as my shock (switched to bleach this year ) and everytime I did it, the pool would be cloudy for 2-3 days. Some of it was by nature of the product and some of it from undissolved granules. Run the numbers on your drop based kit and see where the chlorine level is. If it is within the acceptable range according to the best guess chart, then you should be able to go swimming. If it's slightly above, I'd wear old suits. If it hasn't budged from 20, I'd stay out. Of course, if it's dropped significantly, then something else is in your pool and you've got a fight on your hands (no, not with the family).

Welcome to the forum!