How soon should you test for pergnancy if missed period but periods are irregular?

It is generally recommended to wait at least one week after a missed period before taking a pregnancy test, even if your periods are irregular. This is because it can take some time for the pregnancy hormone (human chorionic gonadotropin, or hCG) to reach detectable levels in your urine or blood.

However, if you have irregular periods and you are concerned that you may be pregnant, you can take a pregnancy test earlier. The earlier you take the test, the more likely it is to be negative if you are not pregnant. This is because the hCG levels will be lower in the early stages of pregnancy.

If you take a pregnancy test too early and it is negative, you may want to repeat the test a few days later to confirm the results. If you still get a negative result and you are still concerned that you may be pregnant, you should see a doctor for further evaluation.

Here are some tips for taking a pregnancy test:

- Read the instructions on the pregnancy test package carefully before you begin.

- Take the test first thing in the morning, when your urine is most concentrated.

- Follow the instructions on the package to collect your urine or saliva sample.

- Wait the recommended amount of time for the test to develop.

- Read the results of the test carefully.

If you get a positive pregnancy test result, you should make an appointment with your doctor to confirm the pregnancy and discuss your next steps.