Pregnancy symptoms after coming off the pill?

For about 2 to 3 weeks after quitting the pill I experienced a cramping feeling, constipation and diarrhoea, trapped wind, and sometimes a metallic taste in my mouth. My first natural period was fine though, quite a lot of blood (more than withdrawal bleed) and I didn't have any cramping. So should I worry about the pregnancy symptoms? Am I definitely not pregnant? The symptoms have all gone now.