When you make your observations, you should try to make them at the same time everyday.
You will be making observations of your experiment daily for the next three weeks.
Be sure to create a drawing, keep notes and take a measurement to gather some data to support or reject your hypothesis.
It is possible that it still looks like nothing is happening in your experiment. This is because each growing environment is unique and plants will grow at different speeds as a result. Keep taking notes, keep looking for things to measure.