If you'd been in my Obstetrics and Gynecology class this summer you would definitely decide to adopt. From a medical standpoint, pregnancy sucks. During pregnancy, you can get high blood pressure, diabetes, or have a thromboembolism. I mean, you could die.
Or worse, you could live to see the day when your tummy is all stretched out, your boobs get droopy, and your organs fall out through your hoo-ha.
Also, after childbirth you have a whiny baby that may very well grow up to resent you despite the skinny body you sacrificed. I suppose an adopted kid could resent you too but at least your organs will still be on the inside.