hi,thanks for query.As you had your bleeding after the pills,had period after about 3 weeks ,there are no chances of pregnancy
.Normally after taking this kind of hormone tablets disturbance in normal routine period will be there about 1-2 periods.The symptoms that you have could be due to urine infection or some G.I. infection.Take light diet,drink more of fluids and take proper rest.Please visit your primary care
physician and take treatment for this.
wishing you good health.