Light brown period ?

Alright, well, to start from the beginning:

My boyfriend and I have had intercourse several times within the past month (I lost my virginity during this month) and we used the pull-out method. Anyway, my boyfriend and I had intercourse the day I was supposed to start my period. It hasn't shown up for eight days now, and we had intercourse four days ago (this time we used a condom). I don't think I'm pregnant because I haven't been feeling naucious, sore/tenderness in my breasts, or any other symptoms. I have had a cold for the past few days though, so I think that it might be a contributing factor.

What I'm really confused about is that I think I'm experiencing my period, but it's different. Instead of it being a really normal flow, it's not making that much of a mess, nor is it really a normal dark red color. It's more of a light brown/light pink color. Is this really my period, or is this something I should be worried about?

Today I tried Vitamin C, and drinking Parsley leaves (which didn't taste that great, but I had two heaping cups of it anyway). I'm also curious as to how much Vitamin C I should intake, and whether orange juice (like Sunny D) actually works for this method.

Please comment/give advice about what's going on. Thank you. ^_^