Hi I am a 23 year old female and I love to bike, one day after biking I noticed a little blood spotting in my underwear, I was a bit concerned because it was my mid cycle and I didn't expect to get my period for another 14 days(I am very regular) later the same day I noticed some light brown watery discharge and the next day I had a very light pink a bit smelly discharge. Just in case I did a home pg test and it came out negative. What could it be? Could it be implantation bleeding? Please help me I am really worried. Thank you so much.

To me, this sounds like implantation bleeding. Implantation happens in about 26% of pregnancies. It is very light. Usually very dark or a pink color. Does not last as long as a regular period. Wait until your period is due. If it does not come, then test on that day. You may have tested too early to show a positive result. Good luck in what ever happens