No — when a form uses "customer chooses" for billing frequency (offering Weekly/Monthly/Annually as a choice on the form), the resulting subscription is always billed every 1 unit of whatever they pick, with no day-of-month preference applied. The day/month controls in the form builder only appear when you've fixed the frequency yourself. If a specific collection day matters to you, you'll need to fix the frequency rather than hand it to the customer.