Hello. I am a nineteen year old female who has had a very light period this last week. I usually have very heavy periods in which i need to use multiple tampons per day. However, this last one i usually only needed one per day. I was wondering if this was implantation bleeding and if i could be pregnant due to the fact that i am sexually active. I am on the pill and we usually use condoms, but not always. I have taken five pregnancy tests and all were negative.I was wondering if i could still be pregnant. I am also having bloating, nausea, abdominal pain, and fatigue very often during the days. I was wondering if you could please answer my questions and help me out. Thank you.