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I tend to be somewhat conservative about interpregnancy intervals and, ideally, recommend a wait of three normal menstrual cycles. Some preliminary research suggests it takes that long for the uterine blood vessels to completely clean themselves out from the changes they've undergone in the previous pregnancy. "Dirty" (for lack of a better analogy) blood vessels may be more likely to clot and give problems to the next pregnancy. Waiting three cycles will ensure that your uterine lining is clean and fresh. It will also give you time to shore up your emotional reserves.

If three months is longer than you'd like to wait, it's very important to at least wait for your first normal cycle. This means you'll bleed and then wait 28 days or so and then bleed again. A normal cycle will let you know that your ovary has been exposed to a normal endocrine environment for one complete cycle. It also means that your uterine lining has had a chance to regrow. Of course, you might get pregnant and have a healthy pregnancy without waiting for your first normal menstrual cycle but, as a specialist who looks at tissue under the microscope, I've seen that uterine linings and their blood vessels do need some time to recover.

In addition, medical literature suggests some increased risk with short inter-pregnancy intervals. Human pregnancy has built-in risks (for example, there's always a chance of random wrong chromosome number accident) and I personally would not "volunteer" for additional risk by choosing short inter-pregnancy intervals.