30 weeks and 6days pregnant and a HUGE crybaby!!!!?

Ok so I litterally cry about everything I'm so emotional over the dumbest stuff I laugh about it cause it is funny but I jus dnt understand why that happens when people are pregnant like I dnt boo hoo like I lost a friend but I dnt cry and get very emotional my boyfriend can't stand it because he knos I'm only like this because I'm pregnant but I seriously can't help not even if I tried my hardest! Is anyone like this or been this way only during pregnancy??