The first thing you should do is try to manually remove as much of the paint as possible using a scraper, or a similar tool (a spoon or kitchen spatula will do). Be mindful that you’re trying to lift the paint out of the carpet, as opposed to spreading it further. If you don’t have this kind of tool to hand, you could use kitchen roll to blot away as much of the paint as possible.

As emulsion is water based, it shouldn’t be too difficult to remove it from carpet using a simple soap detergent and plenty of water. This can be applied using a clean cloth, or kitchen roll. But, remember, your aim is for the cloth to soak up the paint, so it may need replacing pretty regularly.