please help

Sarah • Mommy to 4 wonderful babies and to 6 heaven babies I miss they dearly.
I've had two ectopic pregnancies and a baby after. I'm now 4 weeks 2 days. Since Friday my left arm has been so achy. My muscles feel like I've worked out, but it's only in my left arm. Anyone else?  I think at this point it would be too early for ectopic symptoms?  I've tested again and it's so much darker than on Thursday.