Possible ectopic?

I am 5 weeks 2 days. Today I have had severe pain in my chest behind my heart that goes straight through my back. I had an ectopic pregnancy 5 years ago, which makes me more prone to have another. I have no other symptoms, no cramps or bleeding, not nauseous, dizzy or weak. But I've felt this pain for about 14 hrs now. The deeper I breathe the sharper the pain. Hoping someone has had this and it's nothing. Can anyone give me insight?