Symptom clarification?! Thx :)

Ashley
Hi ladies. So first let me start out by saying I am really good at noticing any type of regular cycle symptom and having it play with my mind into thinking its a pregnancy symptom. Now that I have that out of the way, I am only 3 - 4 dpo and my nipples and breasts are becoming tender. Now I know if I conceived it wouldn't be implanted yet, so could it still be a symptom of conception? Does your body start producing more progesterone when you've conceived rather than if you hadn't? Thanks!