Helpp!! stupid silly mistake!! =(?

i was talking to a few other girls and we got into a conversation about boys. well i havent hooked up before and one girl asked me if i did. and i said yeah with my cousins friend. i just felt pressure to have already hooked up, but now i wish i just said the truth instead of lying! what should i do to fix this?? should i bring up the conversation again tomorrrow and tell her that she misunderstood me?? and that i was supposed to hook up with him?? i cant leave it like thiss!! =( .b/c my closer friends know that i havent hooked up before and if they somehow overhear her say that i did im going to be trapped in a bad corner. please let me know what i should do!! it was be a great help!