Nipple pain

So my bf and I are trying TTC. It has been about 9 or so months now and still nothing. Lately I have been having just about every pregnancy symptom you could think of. Just recently my nipples and breasts have been more sore than usual and feel like they are getting bigger.  And I get little pains in my nipples. Not Anything excruciating just a little annoying pinch or prick like. Could this be a sign?? Has anyone else has this problem?