I am currently in the middle of an ectopic right now. I received the methotrexate shot on Monday and am waiting for the hcg levels to drop. The only signs of ectopic pregnancy that I had were slight bleeding. I had what I thought was a normal period but got my bfp 2 days after the bleeding stopped. I then had brownish spotting for 2 -3 days. Due to the bleeding my Dr. checked my hcg levels and at first then doubled normally but then dropped by half and doubled again, so we knew there was a problem. I then had a dull throbbing sensation on my right side, which prompted my ob to have me go to ER and sure enough there was a little blip in my right tube and we began methotrexate.
My only real symptom early on were hcg levels and bleeding. If you are concerned call your ob and they can track your hcgs.