When a woman is not offering weekend dates, is that a sign of disinterest?

For the 3rd date, I asked if she’s free and wants to do something on the weekend, but she just said week night dinner works better… so I’m going to take her to dinner on a week night. But I have a gut feeling that this is a sign of disinterest from her since she didn’t give a reason why she wasn’t available on the weekend, like maybe she’s going out with other guys. I feel like by the 3rd date, she should be open enough to provide some reason if she declines a weekend date. The 2nd date was on the weekend, and I thought it went well. I much prefer weekend dates since I don’t have to worry about going to work the next morning… But I can see why week night dinner date is like the quick and easy date option, which is why maybe she’s not that interested in me?