I just sent my Bitcoins to a Bitcoin Cash wallet by mistake. Did I lose my coins or will they be converted to Bitcoin Cash coins after August the first?
Assuming you wait until the market decides what value exists in the Bitcoin Cash fork, you should be fine.
If the BCC fork doesn't go anywhere (no liquidity or no value), the BTC fork should still retain your coins and you should be able to spend them later.
If the BCC fork gains popularity, you can trade them there.
You may even be able to trade them both if both forks maintain market liquidity.
Bitcoin Cash is just a future right now: https://coinmarketcap.com/currencies/bitcoin-cash/
It won't exist until Aug 1st.