Will a pregnancy test be accurate 4 weeks in

That said, not all tests are created equal. So the higher the level of hCG is picked up by the tests, the later you will be able to use that test as the hCG builds up in your system. Other tests pick up hCG at levels of 20, 25 or 50. The most sensitive test picks up hCG levels of about 10 in your urine. There are different pregnancy tests available that pick up the pregnancy hormone, hCG, at different strengths. Which Pregnancy Test Is the Most Sensitive?ДЇirstResponse seems to be the most sensitive according to many clinical tests, including Clin Chem Lab Med's study of the product's efficacy. If this sounds a bit confusing and overwhelming, FirstResponse (who produces one of the most sensitive and accurate pregnancy tests) made this handy calculator that helps you estimate when you may have gotten pregnant.

So if you think that your period is due on the 20th of the month, then the most common time of ovulation would be around the 6th of the month. This may only cover 2/3 of the population though, so may not be that accurate. If you do not know when you ovulated, then you can calculate your estimated ovulation date using your period-although it may not be totally accurate! If you have regular-length cycles, then it is reasonably common to ovulate 14 days before the first day of your period, so you could take that as a rough guess. If you are monitoring your cycles because you are trying to get pregnant, then you may well know the answer to this question-but if you are not necessarily trying to get pregnant or just not trying and not preventing, then you may well not be aware of when you ovulated.

So the main factor you need to think about when considering if your period is a week late is: Do You Know When You Last Ovulated? Then the hCG may not show up on the test until 14 days after that (although the likelihood is it will show up a few days sooner) so that gives a possible timescale of 18 days until you can get a positive result in some cases.ДЄlso, you really need to have regular periods to know when your period is a week late! The reason for this is that you can get pregnant by having sex up to 4 days before ovulation. If you do not know when you ovulated but the only thing you know is when you had unprotected sex then you should really wait 18 days for a conclusive result.

Waiting reduces the chances of this-but doesn't eliminate the chances entirely. So, you potentially will get a false negative if you use an insensitive test early when your body hasn't had time to build up hCG. Some are much more sensitive (meaning they can register lower amounts of hCG) than others.

Test Sensitivity: Not all tests are created equal.

The same study goes on to note that 'between 50% and 60% of all first-time pregnancies are thought to end in miscarriage-a large majority of which can be attributed to biochemical pregnancies.' Clin Med Res, 'ne of the possible outcomes of the pregnancy test is a biochemical pregnancy where the initial pregnancy test is positive but does not progress into a clinical pregnancy.' A chemical pregnancy is where the sperm and egg meet, but the body naturally miscarries before the person knows they are pregnant.

Chemical Pregnancies: According to this study by J.

It can take up to six days for the sperm and egg to join. Pregnancy Isn't Immediate: Pregnancy doesn't start the moment after you have sex.

Will a pregnancy test be accurate 4 weeks in