It sounds like you did everything you could to coddle the seeds. The days to germination on some bush beans are 7 to 14 days. If the soil was a little cool (under 60F) that can delay germination. You might just wait a week longer to make sure--it could be that they are just taking a little more time to get up to speed. Past then, however, you might check one of your plantings as a sample for any seed rot or insect/disease damage.
It sounds like you did everything you could to coddle the seeds. The days to germination on some bush beans are 7 to 14 days. If the soil was a little cool (under 60F) that can delay germination. You might just wait a week longer to make sure--it could be that they are just taking a little more time to get up to speed. Past then, however, you might check one of your plantings as a sample for any seed rot or insect/disease damage.