Home pregnancy tests can be helpful for people who are trying to figure out whether they might be pregnant. You can take a home pregnancy test at any time after you realise your period is late, however most tests say that it is best to wait until about ten days after the due date for maximum accuracy.
A lot of people think that a pregnancy test will either be clearly positive or definitely negative, however this is not the case. False negatives can and do happen, and false positives, while rare, can be caused by several factors, including blood in your urine, or by certain prescription medications. The phenomenon of the disappearing positive pregnancy test is real, and if you don’t understand how it can happen it could be quite upsetting.
What is a Disappearing Positive Pregnancy Test
A disappearing positive pregnancy test is a test where the lines are ambigious, or where a positive result appears, then vanishes again. There are a few reasons why this might happen. Firstly, some tests are designed to be used and then read immediately. If you do not read them within the ‘development window’ that the manufacturer states in the instructions then the results may be inaccurate. This is most common with blue line tests, or with cheaper pregnancy tests. On some tests, what looks like a positive result could actually be an evaporation line.
Rather than take chances with this sort of thing, it makes sense to buy a good pregnancy test and do it at the right time (10 days after your period was due), following the results exactly.
If you get a positive result, even one that is not clear, see a doctor immediately for advice. Tell them what you have seen, and have them do a blood test on you – blood tests tend to be much more accurate than traditional urine tests.
If the blood test is negative, then the doctor will look for reasons why the test may have been inaccurate. The presence of certain proteins, or even blood, in your urine can be a cause of false positives. Both of these things can be a sign of serious underlying health conditions, and mean that you will need further tests.
Your doctor will also be able to check for things like an ectopic pregnancy, and give you advice about health in general. In the event that you are pregnant, you may need advice about things like smoking cessation, alcohol, weight loss or maintenance, diet changes, or medications. There are many medications that should be avoided during pregnancy because of the risk that they put on the unborn child, and there are many precautions that you will want to take to avoid complications such as gestational diabetes or high blood pressure during pregnancy. Early detection of the pregnancy, and early medical advice, will help to reduce those risks and ensure that the pregnancy and the birth go as smoothly as possible.