No, it happens to more people than you think. For instance, I would consider myself fully straight but I have had gay thoughts before. This doesn't mean that I am now gay or that I wish to experiment. It just means that I've had these thoughts at some point and whatever, life moves on. Unless you think that these thoughts are a sign that you're actually gay or bi, then it shouldn't matter. If you feel like that it could be signs, then maybe you should listen to them and try to find what your inner self is trying to tell you. Either way, it's not wrong nor is it weird or stupid. It happens and it's okay.