do i have prenatal depression?

hey, so i’m 31 weeks pregnant and lately i’ve been really sad and mad at my boyfriend for no reason. i had depression to start with before even getting pregnant. last night i just lost it and cried for about two hours because i thought my boyfriend didn’t want to be with me anymore, when he literally has given me no reason to think otherwise. i just felt so overwhelmed and just overall upset about everything. i’ve been suggested to go see a therapist by my doctor twice now but i haven’t gotten myself to do it. i’m just too scared and especially with my past experiences i don’t think it would really work. i was just wondering if anyone else is going through this?