You are most likely not pregnant if the pregnancy tests you have taken are all negative. Rather, you may be experiencing irregular cycles. You can request hormonal analyses (FSH, LH, prolactin, estrogen, progesterone, testosterone, DHEA), and a vaginal ultrasound. It is very important that you find out if you are ovulating, or not. Women without ovulation usually experience irregular cycles which defer from the normal periods. These types pf “periods” are usually painless and with greater bleeding. You can go immediately to your gynecologist for the examinations described!