I think that it would make sense that you would look pregnant if you missed the period that is making you think that you are pregnant. That blood is sitting in there, and I would guess that it is probably building up more of a supply, at least until you have you period this cycle. I know of people, myself included, that were really late and we all got pretty swollen. I would definately see a doctor ASAP and have a blood test, although I think that a good over the counter test would come back with the correct results at this point. I am sure that you have invested in that though!! I really hope you are pregnant, but because the tests are consistantly negative, you have a higher chance of not being pregnant. So here is what I think.....
After reading everything that you have been writing about
Start BD'ing as soon as possible and get yourself knocked up!!
hehe...we all want you pregnant!
wife - mother - midwife
The more you know, the worse it gets.