38w 5d pregnant, and busting every 5 minutes?

Toward the end of your pregnancy you will have what's called lightening or "dropping" where the baby engages even lower in the pelvis. The main signs of this are that you dont' feel the baby up in your ribs as much as you used to so it is easier to breathe and you have to use the bathroom much more frequently since the baby is pressing your bladder almost completely so it can hold only a small amount. There is no reason to be seen for this alone as it's completely normal.