Pregnant with mental health problems

I'm 15 weeks pregnant and for the first trimester I was generally happy. Recently I've gotten very depressed and irritable. I'm diagnosed with major depression and PTSD, I stopped taking my medication when I was about 5 weeks, as soon as I found out. I try to quiet the thoughts by myself but sometimes it is very hard. Is there anyone else out there dealing with some kind of mental health disorder and do you take medication? My boyfriend wants me to ask about getting put back on some meds but I'm concerned.