Blood test normal 😩

Helen

Can anyone help , I have had irregular periods since I started them, went on bc then came off 8 months ago to ttc . I’ve just had some blood tests and everything came back normal... why am I irregular ?? I’m on day 29 and still not ovulated and getting really down about it now , I can’t get pregnant unless I ovulate which I’m not doing , yet all the hormone level , thyroid tests came back normal 😔 are irregular periods normal ?? It doesn’t make any sense