How long do you have to wait take a pregnancy test if your period is irregular and over 35 had unprotected sex?

It depends on the specific circumstances and your menstrual cycle. Here are a few general guidelines:

1. If you have a regular menstrual cycle, you can take a pregnancy test 14 days after unprotected sex.

2. If your period is irregular, it may be more challenging to determine when to take a pregnancy test. One approach is to track your cycle using an app or calendar to identify your most fertile days. You can then take a pregnancy test 14 days after your most fertile day.

3. If you are over 35 and have unprotected sex, it is advisable to take a pregnancy test as soon as possible, regardless of your menstrual cycle. This is because fertility declines with age, and it can be more challenging to conceive.

4. It's important to follow the instructions on the pregnancy test package carefully and understand how to interpret the results. If you have any concerns or are unsure about the results, it is always a good idea to consult with a healthcare professional.