Trains from Cardiff after Saturday night events

I'm looking to go to a rugby match in Cardiff in November that kicks off at 8.10pm and so will finish about 10pm. The last train back on a Saturday to Temple Meads is 2247 which gives me anxiety. Does anyone know if they usually lay on extra trains going back to Bristol for big rugby games/events on Saturday nights? Or just hold the trains so that everyone can get on. I've been to plenty of games in Cardiff but not one this late on a Saturday.