Ovulation test paper will be negative after pregnancy. Ovulation test paper is to check luteinizing hormone in urine to monitor ovulation, it will be positive only during ovulation, after pregnancy there will be no follicle discharge and the ovulation test paper will be negative. After pregnancy, you no longer use ovulation test paper, you need to use early pregnancy test paper for early pregnancy check, it is better to wait for a week after menstruation delay before you can use early pregnancy test paper, the check is relatively accurate, you need to use morning urine for early pregnancy check, pay attention to rest after determining pregnancy, regular blood sampling to check HCG and progesterone, if progesterone is low or HCG is low consider having miscarriage or fetal dysplasia, you need to review it regularly. If the progesterone is low or the HCG is low, miscarriage or fetal failure should be considered, and regular review is needed. Around 40 days of pregnancy, you need to go to the hospital for ultrasound examination to exclude ectopic pregnancy.