I had a baby in November. Healthy pregnancy & delivery. Tried once to conceive him, that's it. Period came back in December. At first it was irregular(it would be a few days early for couple months. My husband & I want our babies close in age. I've been <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> with opks and the past 2 months I've noticed 9 days after peak fertility..AF shows. This month is different-peak on the 4th..9 days later no AF and now I'm 16 dpo and still no AF and negative pregnancy tests. I'm guessing AF is just late. Before I was pregnant..my cycles were always the same day every month. Anyway..someone mentioned my luteal phase is short and to take a b complex vitamin to help it lengthen. Has anyone done this and it helped? I'm also going to start temping. Hoping I do that right also.