I have been having unprotected sex with my partner, during the middle of my cycle, i usually have really heavy and really painfull periods but this month its really light barley any at all and it dosnt hurt at all. i did feel sudenly sick the othr day (i wasnt sick though) also on another occasion i woke up with a terrible head ache, tierdess, like i had a severe hangover even though i hadnt had a drink or done anything unusually, your answers would be appreciated.