What am i meant to do if iv just had sex and my vagina is a bit swollen on one side? ice pack?

Good idea: Do try cold compresses (not too icy) and fragrance-free talcum powder to keep the area dry. Also, you could try yogurt-soaked tampons. The natural bacteria in the yoghurt can help restore a balance, thereby reducing irritation from any possible infection. You can also try soaking, for short period, in bath with bicarbonate (sodium bicarbonate) of soda. Sulphur dissolved in water helps. Have a bit of gentle sex. Best!