How important is it to you to know exactly when you conceive? (To me, that's very important as it can really help with issues that may arise re: the timing of your pregnancy - to know when you are actually full-term, post-dates etc. and to not have issues with ultrasounds and measurements being wrong.) I say that because you could ovulate at any time and then only find out you are pregnant later, so I'd probably use a barrier method until I get a period so I can chart - in fact I'd even advise charting a cycle or two first if you're not in a rush before actually consciously trying.
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