Quoting Roe23:" If your cycle is 28 days, it is likely you will ovulate 14 days before your next expected period (really ... [snip!] ... before they ovulate (sperm can live for up to 3-7 days in optimal conditions, waiting for an egg). You might be fertile now."
Thank you! Also, I will definitely be looking into that book! It's always been really screwy, pre-baby it was irregular. Post partum I got mirena, still haven't had a period. Started having a visible period again within the past 3 months. Just removed the IUD, this is all a whirlwind. I admire those of you who can keep tabs on all this. Thanks again, so much.