As a general rule, two months is a safe time to bring up the topic of taking the relationship to the next level. However, every relationship is different and if you feel ready before that, go ahead. Before you have the conversation, it's important to prepare yourself for the possibility that your partner may not feel the same way. That's why Conti suggests taking your time when you first start dating someone.
She recommends waiting one to three months before making the relationship exclusive. After all, five weeks of someone's time is a lot to “waste” if things don't work out. But if you're seriously considering taking things further, there's no need to rush anyway. If it's been difficult to get those ten dates in due to anything other than scheduling conflicts, it's probably not worth pursuing.
Remember the movie based on the book “He's Just Not That Into You”? If you're thinking about talking to your partner, it's important to be honest about what you want and need in a relationship. Don't put too much pressure on yourself to make it a grand gesture - just say what you feel and be honest about your feelings.