Worried about my period. Help!

So I'm due to get my period any day now. For the last week I've been super emotional. Yesterday and today have been the worst so far like I haven't been able to stop crying and I have no reason to. I'm worried I may be pregnant or it's just bad PMS that's worse than normal. I've been pregnant before (didn't have the baby) and I was super emotional but I had other symptoms like heart burn, constipation, bad anxiety, cramping, bloating, some nausea. Right now I'm just super emotional. Could it be PMS? What are your thoughts?