vaginal bleeding?

Paige
Can I be pregnant, and still experience bleeding, like a period? 
We are TTC and all of a sudden today I've been extremely nauseated anytime I eat.. ONLY when I eat..? I've NEVER been nauseated, while on my period. My period is MUCH lighter than normal, and it doesn't even look like normal period to me..? Usually I have to change my tampon every 30mins or so, when on my period because it's so heavy.. but I haven't even filled a tampon yet, and I've only changed my tampon 3 times today...? I haven't testsed, but I am curious?