Minor Leg Injury - Best Quick Fix?

Today I was cycling and a car did an illegal U-turn right in front of me (would all drivers out there PLEASE be wary of cyclists). It wasn't a big crash, but my left inner thigh aches a fair bit when it's moving or if I put all my weight on it, but it's alright when stationary. There's no bruising, and I managed to cycle about 11 miles home afterwords. Problem is I have training to be a rickshaw rider (bike taxi rider) in about 18 hours, and I'm worried it worsens. I'm letting the company know now as a precaution, but what should I do to give it every chance of being alright tomorrow? Thanks!