I am 4 dpo and I was wondering if there was any women out there that experienced tender nipples this soon. Could this be a sign that I could be pregnant or getting ready to start my period?

It could be either, but I would say that it is very soon for it to be pregnancy related. Wait until a week after you miss your period before you make any conclusions.

I was at least six weeks before I started having ANY signs (other than the missed period). Then it started with the sickness. The tender nipples did not start until a few months in, so I would not worry just yet. If you are on any type of prevention (pill, patch, shot) these can often cause you to have mild symptoms of pregnancy, even though you are not also.

No I am not on anything and we are trying...

With my pregnancies, It was always 6 weeks+ before I even had an inkling I was pregnant... good luck, it can take a while. Just don't stress about it, go with the flow.

While it is possible, it is highly doubtful. See it takes time for your system to build up Hcg, the pregnancy hormone that tends to cause pregnancy symptoms. 4 days is typically not enough time to build this hormone up and get symptoms.

Understand also that premenstrual symptoms mirror pregnancy symptoms many times. You may just be building up for another period.

However, it seems as though you are stressing about getting pregnant. You realize that stressing can make it HARDER to get pregnant.