nervous... positive pregnancy test but pains in lower right side


so my period was due over a week ago I woke up 2 days ago with a very sharp pain to my right lower abdomen (it was so bad I literally fell to the ground) I have been spotting dark brown. I took a pregnancy test today it came out positive!

I've had a miscarriage before last year in June.....

But this pain was more intense than what my miscarriage felt like. it has only happened once but I'm still spotting

what should I do?

should I be worried