In need of some advice.

Me and my husband have been trying to conceive for about 5 months now. My period is two days late and I'm trying really hard not to get my hopes up. But the last two weeks my boobs have been sore I have been super moody and emotional and have literally spent the last two days crying. I can't even eat because I'm crying so much I'm getting sick at my stomach. Could anything other than being pregnant cause this?