1. Your spouse changing emoloyers should have no bearing on the H-1B petition filed on your behalf. You could only face an issue if you opted for a change of status and some how fell out of H-4 status prior to your H-1B change of status taking effect.
2. No. You do not need to file an H-4 transfer.
You can read more about work visas at http://myattorneyusa.com/family-immigration.
Answered on Jul 27th, 2016 at 2:53 PM