Confused About My Duedate

This is my problem I have irregular periods. I rarely ever get it on time. When I found out that I was pregnant I thought that I was about 14-15 weeks. I started spotting the day after I found out that I was preggy. I went to the hospital on 12-21-03. They checked me out and siad everything looked good with the baby but that there was no way that I was 14-15 weeks. My blood count came out to show that I was 6-7 weeks. But it didn't make sense because my last menstral cycle was on aug. 26,03. So the days didn't add up. In january for my fisrt official prenatal visit my doctor checked me and said that my uterus felt about 8 weeks, this was on jan 07,04. So she gave me my edd foe aug.16,04.
On jan 17.04 I was in the hospital because mt son was jumping on the bed and landed right on my stomach and I started to get pains right away. I had my first ultrasound by a doctor friend of my mothers and she said the baby was fine and I was 9 weeks and 3 days. Then she siad that my due date was on aug. 18. 04. That's two due dates so far. Then I had a scheduled sonogram from my doctor to find out how far along I was. That was scheduled for feb. 3. 04. That day they tell me that i'm 11 weeks and 3 days, which would make 4 days less than the first ultrasound that I got. And my due due date would be aug. 26. 04. That's 3 due date now. When I was in the hospital on feb.15 04, from tripping over my son's toy which I already posted they said I was 13 weeks and I can't even remember how many days, but they gave me a due date of aug.21.04, that's four. Now when I was in the hospital for the hernia two days ago. Or yesterday morning which ever way you look at it. They said I was a few days more, supposenly I was to be 15 weeks in the 25th of feb., but he said I was 15 weeks and 4 days, and gave me a due date of aug. 15, 04. They are all within a few days of each other, but none the less I 'm confused like hell. I was looking at the survey that we all filled out about where we're from, how far along are we, and so forth. You know the sticky page on the top of the forum. When I filled it out I was 13 weeks and ansley2004 was 11 weeks. They have her due date as aug.29.04, so how is it that if I am two weeks ahead of her one of my due dates could be aug. 26.04. I don't know what to think do you guys think this caca is wired like I do. I want to be prepared but don't know when to prepare myself for. My son was just born 3 days before his due date. I don't know what to think, that's why I haven't put myself on the due date list. I have a doctors appointment on march 3, i'll just wait to see what she tells me. I hope I didn't confuse anybody with all this caca.

Brenda