If you start your period on the first and have a 28 day cycle what can take pregnancy test?

If you start your period on the first and have a 28-day cycle, the best time to take a pregnancy test is 14 days after ovulation, which is approximately day 18 of your cycle. This is because it takes time for the fertilized egg to implant in the uterus and produce enough hormones to be detected by a pregnancy test.

However, it is important to note that pregnancy tests can vary in sensitivity, and some tests may be able to detect pregnancy earlier. If you are concerned about whether or not you may be pregnant, it is advisable to take a pregnancy test as soon as possible.