Thanks for your query. As the UPT has come negative most probably you are not pregnant, but not to forget it could be a SUBCLINICAL pregnancy
as well. So nothing to worry, just wait for few days you might get your normal periods. And if your subsequent periods are abnormal, I suggest you consult your doctor. As you are already 30 I suggest you plan your pregnancy fast.
I hope this information has been both informative and helpful for you. In case of any doubt, I will be available for follow ups.
Wish you good health.