I am currently 27 dpo, on cycle day 40, no sign of af at all. Had some cramping last week for a day or two and nothing showed. All pg tests have been BFN so far, starting to get down about it. Extremely tired, more tired than usual, I have been having vivid dreams and get weepy and moody at random things. Nausea on and off, haven't actually vomited yet. Lower back pain, like around my hips.  Have been also having pms symptoms on and off. Any thoughts?