I just had my period like two weeks ago and it came back again after my fertility window open it came yesterday my cycle is that normal?

Irregular bleeding: A typical menstrual cycle (from beginning of one period to next) is on average 25-30 days. Everyone is different, some people can have shorter or longer. Some people do have some spotting with ovulation or implantation) about halfway through cycle). If this is a change in your normal cycle, keep a log of your bleeding. Take a pregnancy test. And consider seeing a doctor if not pregnant