You can temp whilst on the pill, but there wouldn't be much point to it. Temping works because the different hormones through your cycle affects temperature, being on the pill restricts those hormones so you're more than likely going to get a chart with very little variance throughout the month.

You can try the other methods of gender swaying before your cycle gets back to being regular - diet changes, things DH can do & altering the PH level in your vagina (I think details on all are in the gender swaying thread). I think though you'd need to either be temping or using OPKs to accuratly do the timing part of gender swaying. Even then I don't think your cycle woud have to be very regular, if you are checking CM & doing all those other things you'd see the pattern without having to have a regular cycle.