It's up to you. If you have the money to buy bitcoin now, then buy. But if you don't have enough funds yet to buy now, all you have to do is to wait and still wait for the bitcoin price to go down until you can afford it. By the way, what is your plan if you have already bought bitcoin? Are you going to hold it or will invest on it? Because it would be better first if you have enough knowledge into bitcoin and overall how it works to avoid the losses.