You most likely do not have grounds to sue.1) First, you'd have to be able to prove with medical evidence or testimony that if you had known you were pregnant, you would not have miscarried--that is, there must be evidence proving that the wrong test result caused the miscarriage. That is not likely to be easy, or even possible to do. What you "feel" would have been different is not enough: courts demand proof. And even if you could prove this, hiring a medical expert (such as a doctor) to examine you, write a report, and testify in court could cost as much or more than you hope to get back (you can't get your expert costs back; you have to bear those yourself in a lawsuit).2) You'd also have to show not just that they were wrong but that they were unreasonably careless (negligent) in how they gave the test or interpreted the test results. The law accepts that sometimes doctors do everything write but things don't work out--especially in situations like pregnancy tests, which do NOT have a 100% accuracy rate. If the doctor/hospital did everything right but the test gave a wrong answer, they are not liable or responsible for that.