I was recently taking Nortrel 777 and it made me sick almost everyday. So I decided to switch to a lower dosage called Junel. I usually get my period on time but the month I did the switch, I got my period the day I was expecting it, however, it only lasted for a day. At first it was red, a regualr period color, then towards the end of the day, it was a brownish color, then it just completely went away. I always take my pills on time, never missed it at all. Could I be pregnant? I'm really worried???