I think I'm pregnant!

So my boyfriend and I have been trying to get pregnant for about 5 months now. We've had little scares here and there but I always got my period. I was starting to think I couldn't get pregnant! But recently I've noticed some changes... I'm 4 days late, which has happened before and which is why I'm trying not to get my hopes up too high; my breast have been super sensitive for over two weeks now. At first I thought it was normal since I tend to get tender breasts a week before my persiod but it's been almost 3 weeks since this has been going on. Another thing is that I've been cramping but no period (I heard this is also a sign of pregnancy). And one of the biggest things is that I'm super emotional & sensitive (again, this usually occurs before my period but it's been an ongoing thing for about 3 weeks now).