Me and my fiance have been trying to have a baby again. My periods have always been very regular even after my miscarriage last year. This period was supposed to start on 5/13 according to a period calendar app on my phone. Mind you that this app has been very acurate for me and when it says I'm going to start, I do. On that day I had one pea sized drop of blood and then nothing else. I looked it up and suspected it was implantation bleeding. I was so happy thinking I was finally pregnant again! I took 3 pregnancy tests but they call came out negative. I looked that up too and it said that some women are different and some just dont produce enough hog hormone for it to make a positive test and for some women they were a month late before they ever got a positive test. Anyways, yesturday 5/25 I finally started my period. The app on my phone said I was 12 days late for my period so when I finally started I was so surprised and heart broken. Why is this period all the sudden so weird out of all the regular ones???