Cycle day 36. irregular periods always, not this long in months. neg preg test 4 days ago but positive ovulation test today. should preg be discarded?

Maybe not pregnant: Maybe not pregnant. Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened). If done sooner, a negative result may be due to testing too early such as less than 2 weeks after conception.

Negative test: A negative pregnancy test today means that you are not pregnant right now. If you are truly ovulating now then one would not expect a positive pregnancy test until about 2-3 weeks later. If your periods are irregular then it is not possible to predict ovulation. See an Obgyn for irregular periods