Addenbrooke's Hospital
Research and Development
The Rosie Hospital
How do pregnancy tests work?
Pregnancy tests can tell you if you are pregnant but they are not always accurate during the earliest stages of a pregnancy. Most of them test for special hormones in your urine, pee. They can usually be used from the day your period was due.
I have had a positive test but a more recent one is negative, what does this mean?
Some pregnant girls or women have a positive test but then a negative one later on, this can be because the pregnancy has been spontaneously 'lost'. This is often the body's way of preventing a pregnancy of a damaged embryo, and doesn't mean that future pregnancies will be problematic.
Telephone SHAC for advice
Lines open Mondays to Friday: 0900 to 1630 hrs
Tel: 01223 217 774
There is a drop-in service for young people (19 and under) on Mondays (12.00-14.00).
Cambridgeshire Sexual Health Services
Book an appointment online
On this site:
> Clinic 1a: Genito-Urinary medicine