Shed some light?

Hello everyone! This is my first post here! My husband and I haven't really been /trying/ to have another baby (currently have a little one who will be Two in august) but we haven't really been not trying to have one. Anyways, my periods have always been very very random, in fact I can go months without having one. It took us about three years of us "not really trying but not preventing" a baby to have one. O recently started on medication that has regulated my periods a little better and they're about 34 days apart. My last period was about three and a half weeks ago and last week I had some spotting for about four days. Shortly after, I've been feeling very nauseous throughout the day at random points and a little crampy. I've also been having headaches which I often have so I'm not sure if it's really relevant. My cm the past couple days (without getting too personal) has been moderate and kind of milky. I took a ept on Sunday but it was negative. Any insight? Sorry for the long post!