What Are The Symptoms Of Pregnancy?

So on February 23 I had lost my virginity. He did not wear a condom but I have been on birth control (the patch) for over a year now. On February 26 I had gotten pinkish discharge, heavy bleeding like my period then brown discharge. This whole thing lasted for about 3-4 days. My period tends to last 4-5 days. I am completely stressing out about this. The only thing that I have noticed that s been different was I have been feeling a bit tired, headaches every now and then but nothing severe like a migraine. Also I ve noticed that my right breast has been having some what noticeable veins. I took a pregnancy march 09 ( two days before my period was due ). It came out negative. On march 11, my period came on time. It seemed watery at first but then became heavy. Which happens every now then. It is march 12 and it now seems to be getting a lot lighter compared to yesterday. But before my period. I had gotten brown discharge, which is also normal for me before my period or during my period. I plan on taking another test next week. Could I be pregnant?