Need help/advice please 😭😭😭

I'm 13 weeks pregnant tomorrow. I lost a large chunk of my mucus plug just now (yellowish brownish, size of a quarter) I've been having a lot of cramps and pressure in my lower abdomen. I've been stressed every day of my pregnancy, sometimes to the point where I contemplate harming myself/overdosing/suicide in general. I have bipolar I disorder and am recently not getting enough sleep (starting to be symptomatic). People tell me not to worry, everything will be fine... But I don't feel like anything is fine or ever will be. I don't know if I should go to the ER. I'm scared confused depressed and I don't know what to do.