I know it's highly unlikely to have Pregnancy Symptoms already but I need to know

Hi, so I Need some Advise/Help, I am having some bleeding that looks A LOT like a Period, the only thing is the scent and the Color are different, it is like a bright red color(the color  looks like when you get a paper cut) I have never had that before and kinda heavy but not at the same time, there are Blood Clot(s) but they are small, I have already had My period this Month it stopped a few days after My birthday which was the 14th. I had unprotected sex the 19th,Last Night and Today i had some lower back pain on the left side  and My Stomach was acting funny (Gurgling, Twisty Felt funny), I am now feeling kinda sick to My stomach almost like I am nauseated, still am having the pain in My back but it is on and off and My boobs feel a lot harder I had unprotected Sex with My boyfriend and yes he did Ejaculate inside Me, what do you think?, is there a Possibility of Me still getting Pregnant? I won't know until Mid-February of 2013 and I know it's highly unlikely to have Pregnancy Symptoms already but I need to know what If there is a chance of Me being Pregnant or not, if So I have to stop Drinking ETC, what should I do?,

Please Help :( ,I am in desperate Need of advise.