If it's only about your heart, and your heart doctor says it's okay, go for it. My friend had heart surgery a little over a year before she got pregnant. Everything went smoothly. She is now pregnant again (about halfway with a 15mo old) and her heart doctor again says she should be fine. If you do get get pregnant, I'm sure you'll be considered high risk, so please keep up on those appointments! Plus if they gave you too much blood, you may want to consider another hospital (just a thought). Good Luck!