Suggest Treatment For Delayed Periods

Hello, for the past 2 weeks whenever i eat something i always feel sick afterwards, whenever i wake up i feel faint and im always tired. Im also a week late on my period. I'm on the pill but the past month i kept forgetting to take it. I went to my local doctors the other day to discuss this with them and they said they can't provide me a new packet of the pill just incase im pregnant. I took a test and it came back negative yet im still a week late. Could i be pregnant??