I have been RCing every 20 minutes for 5 days so far and have had no reality checks in my dreams… it is getting anoying now especially when im talkin 2 girls and i start looking at my fingers and counting them, and they just look at me strangely. I want to RC in my dreams but i can never do it.
5 days is too short time to say that you can’t do it 
i was RCing for more than 2 months before i did it in a dream. 
when RC works for first time: incredible feeling!! was so worth it… you should look forward to it
RCs also work better when you associate them with your most recurrent dream signs. and maybe use them alongside another techinque, like MILD. good luck