<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, im trying to conceiveMy menses is regular - is on 21 feb, 20 mar and 17 aprilI just started to buy test kit on this month. the conception date should be 28 to 2 may isit?uses test kit on 28 to 30 april but it just show negative. so when should i use the test kit? is it reliable?Please adviceLeo  <response>: Hi Leo, Urinary test kits are very reliable. If not sure try different brand. They pick hormone level as low as 25Iu. You have to check early morning first urine sample, 3 Chat Doctor. Wait for 30 mins, not just 5 mins. Sometimes test is weak card may get positive in the wastebasket. It will show positive on next day of your missed periods. I mean if you are expecting period on 3rd, for e.g., wait for 2-4 days test on 6th or 7th. If negative wait for another week, test again. If still negative meet a gynecologist for hormonal with 