Hi my last period the blood was very dark brown I am still having a slight bit of brown discharge now my period has finished I'm having a very lot of pain and now have a small hard swelling on the right hand side can anyone help

Make an appointment with your doctor. Only your doctor can diagnose you properly.

I had brown spotting like that and pain in my side when I had an ectopic pregnancy. Please go to your dr. asap! If you have an ectopic pregnancy and your tube ruptures, you can die. It is serious. But if caught early, it can be treated fairly easily. So yes, please go to your DR! Also, with an ectopic pregancy, your home pregnancy tests might not show up as positive because there is lower than normal hcg in your system, so please don't use that as a guide.