If you've been pregnant since June, they should be able to pick up the baby on ultrasound and verify the fetal heartbeat. Hasn't your midwife had the heartbeat checked or arranged for an ultrasound yet?
It's not the first time I've heard of women having blood and urine tests say negative when there's a baby in there. In cases like that -- they're rare -- you have wait until the baby is big enough to be detected through other technology.
what is your question? cant your midwife help you?
whats the heartrate of the baby? and what are your pregnancy symptoms?