Probably not. If you are using Pay By Group checkout through one of our partner businesses, it's possible that the inventory is being held, but that is unlikely. (How do I tell if I'm using Pay By Group Checkout?)
If your Pay By Group is being held for you, you will see the hold deadline on the Details tab of your dashboard.
If you don't have a Details tab at all, the item or service you're trying to buy is definitely not being held for you.