30 days free trial Wahoo


I’m new to Zwift, and I just finished my 7 days free trial. So I entered my Wahoo code to have 30 days free trial and continue zwifting. But they tell me that my next free trial begin in 20 days, the May 1st. But I really want to zwift before! I don’t understand why the free trial doesn’t start at the end of the 7 days zwift free trial. And more, I can’t buy subscription from the zwift shop, I need to wait to finish my “free trials”. Is this normal? The additional free trial only start the 1st of the month?

Sorry for my english I’m not!