In the classic 1980s film, Back to the Future 2, Marty McFly and Dr. Emmet Brown used a car fitted with a time machine to travel 30 years in the future, arriving on Oct. 21, 2015.
The time it takes for a pregnancy test to become negative following a miscarriage depends upon the gestational age at the time of miscarriage. For any pregnancy, whether it ends at term, preterm, or in miscarriage, a urine pregnancy test should be negative after six weeks. If it is not, there are three concerns:or any pregnancy, whether it ends at term, preterm, or in miscarriage, a urine pregnancy test should be negative after six weeks.
The hormone that your test measures is known as hCG, or human chorionic gonadotrophin. âIn a chemical pregnancy, or very early miscarriage, the test is initially positive but then your period may start, or a further pregnancy test is negative. âThe reason it is termed a chemical pregnancy is that it is only the missed period and positive pregnancy test that show that you are pregnant.