Thanks everyone, went to the Dr's and she said she would LIKE me to have one but understands my concerns and has agreed to wait until after bubs is born.

She said as i had altered results last time she would like to know whats going on but as i am so far along says it's prob best to wait so as not to cause myself any stress if i do bleed or get abnormal results, she also agreed that pregnancy CAN give false results and doesn't want me worrying.

Thanks everyone for your advice, followed my instinct and NOT looking forward to my 6wk check-up now... lol