I was just going to say what playfelt mentioned... I wouldn't expect the calls to flood in for June care until April or May, truthfully. I find it rare that people look that far ahead.
But I would definitely keep advertising, and reassess your ad material. I started advertising as "Opening in July!". I changed it to "Spaces available as of..." and the traffic increased immediately. It's not that you are going to hide the fact that you are a new provider; moreso that you will tell them that after they have met you, and you have "wowed" them!
Best of luck, my dear~!