My periods have been running between 24 and 27 days alternating each month. My last period was on April 5th and lasted only 2 days (which for me is short~usually 5 days) I did my first OPK test 9 days later and it was negative. I continued testing through until my 14th day and all tests were negative. On April 21st (day 17) I started to spot light brown usually when I wipe, but not a lot. There is rarely if anything on the pad. I have been spotting now for 4 days and my AF isn't due until next week (28th-2nd) sometime. I have had menstrual type cramping for the first few days and I feel nauseated at times... usually in the morning till noon and sometimes after I eat, I still feel hungry. I took a HPT which came back negative. On the 23rd. Did I test too soon? Could this be implantation bleeding or early period?

Hi I am experiencing something similar to you wondering if I am randomly having a 23 day cycle or if its implantation bleeding. Sounds like you could be pregnant a friend of mine didn't get a positive pregnancy result until she was 6 weeks pregnant and even the blood tests were negative she thought she must have something seriously wrong with her as she was vomiting etc, everyone's hormone levels are different so they say, don't know if this helps you but may have been testing too early wait until your period would be due and test then also did you buy an early detection test? Good Luck xx