I took birth control (Minerva)for about six years for my skin. I stopped taking the pill in October last year. Since then my cycle has been irregular. My last period was 16 Feb. Should I be really worried about this? Or could it be normal?

Common problem. Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. There are many options available to help regulate the menstrual cycle. You could restart the pill for example. Schedule a visit with an Obgyn to discuss options.