i did bjj with a fresh cartilage piercing and it was rough. two things i reccomend:
1. buy some small plastic retainers....they are little pieces of flexible plastic with a flatish/round end. trim them to fit the piercing almost exactly, then cover both sides with a good waterproof tape (possibly with a bandaid underneath) This is far, far better than trying to cover the ear with the piercings in. (Note- you can also use good quality fishing line, trim to size, and put a flame to one end for a second till it smolders and makes a bump. Cheaper than retainers)
2. get a headgear like the cliff keen tornado...it makes a bubble around your ear and generally stays in place
also invest in some H2Ocean to spray on right afterwards