Am I pregnant? Please Help

Sarah

Ok so me and my husband have been TTC for 6 months. Last period was 08/03 and I'm currently 28 days late :(. I have regular 28 day cycles with an occasional 3 to 4 days late due to work stress (however I've never been this late). I have been experiencing symptoms such as extreme exhaustion, dizzyness, daily cramping and pulling sensation, breast changes and being queezy every so often. I've been taking HPT's every 3 to 5 days and have all been BFN. Had a blood test done when I was 18 days late and had a BFN. Got an ultrasound this morning and saw something that could mean I'm 2-3 weeks pregnant (after searching online) but not sure. Can't see doctor till next Tuesday. Can anyone share some insight. I'd very much like to know what's going on, I'm so frustrated...