This scares me. Help? It is really weird!?

It could possibly be a Urinary Tract Infection. These can occur from many different factors. I would also suggest getting tested for ually transmitted infections. If you wish to try and fix it yourself then I would strongly suggest frequently drinking cranberry juice as it is a natural diuretic and can flush out your system. Also when on your period ocionally senses can be heightened and it is not unusual for you to gain an increased sense of smell, this coupled with being slightly more self-conscious during your period may be what has led you to start noticing your body odour. Try using a roll on deodorant instead of a spray deodorant. If you are from the UK then Boots sells deodorant called Mitchum which is very very effective for people who sweat or smell more than others. If this heightened sense of smell occurs completely away from when your period occurs then it could be caused by other medication, stress or other factors that could affect your brain's normal functionality. Definately drink cranberry juice frequently and if the problems persist I would suggest getting tested for STIs, hopefully it might just be a yeast infection which is very easily curable with special cream.