I have been known to have abnormal periods in the past, they have been late at times and dont last the whole cycle at times. The last few times have been completly out of wack and im not sure whats going on? The first period of the last 3 was normal, came on time 28 days which hardly ever happens and stayed the course with my usual symptoms, the 2nd period then came earlier after that.. prob about 21 days instead of 28 and lasted as normal. And the 3rd period was 3-4 weeks late which lead me to think i may be pregnant. So i took 2 tests both with a negative result and decided id wait to see what happens. A few days later i got what i thought was my period... however it was extemly light, no pain at all, only lasted for a day or 2 and it was gone??? Usually my periods are heavy and painful and considering i was so late i figured i was in for a very horrible time when i finally got them due to build up of blood or something... I need help cause im not sure what this means??? Am i pregnant? Is there something else that may be the cause??? Im not on any contraceptives or medications.