Could I have gotten pregnant?

My fiance and I had once in the past month. We used a condom. I was on antibiotics for a tooth infection so I stopped taking the bc pills since the doc said it would make them ineffective anyway. Now my period has not shown up. I'm getting signs of a period, except NO BLOOD. And I've had an extra symptom...I'm hungry all the time, hungrier than usual. And last week I wasn't hungry at all. I usually have a normal appetite. I took the preg test and it said negative. But I think it might be too soon bc I'm going by when I would have the period according to my bc pill schedule, but since I haven't taken them for almost a month, maybe my period is supposed to be here in 30 days instead of 21? Either way I was supposed to have my period according to the pill schedule last Wednesday (March 11th.) The cramps were here last week, and now they are completely gone. I want them back, and I want my period! I really doubt I could be pregnant, I mean, it would be immaculate conception pretty much! What do you think?