Random PP thoughts

Old navy is having a sale and I’m tempted to buy some jeans but I don’t even know what size I’ll fit into after I give birth. before getting pregnant I was a size 12/14. I’ve only gained like 6 pounds in total my morning sickness was CRAZY the first 6 months so I lost a lot and I’ve recently started to gain the past 2 months. So honestly I don’t even know what size. I’m sure it’s not going to be a drastic change so I should get the same size, right??