week 5 might have chance to see the sac in uterus already. if u are worried, u might want to choose to go see another gynae or see if there is any last min cancellations for current gynae.
As soon as I found positive on home pregnancy kit, I informed my gynae as I had ectopic in past. He gave me my first appointment at 6th week.. I think sixth week should be ideal
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rish