Unreasonably upset prego wife here...

I find that since becoming pregnant marriage is so much more difficult. I’m so much more sensitive, I feel like a burden on my husband, and am truly feeling depressed. I’m just over 19 weeks pregnant with my first, and this was a planned pregnancy, but I didn’t expect it to be THIS hard. I find I’m more hard on my husband and less forgiving, even of past mistakes that have already been resolved— I just can’t let go of things. My heart hurts, and my marriage is hurting because of it. Don’t get me wrong, I love him deeply, and he loves me. This mental state seems to have come on since pregnancy, is that a coincidence or is it normal to be feeling like this? Everyone talked about PPD, but is it normal to be struggling WHILE pregnant? Is this something I should talk to my dr. about during my next appointment? Seriously, any advice helps. I’ve never felt more alone in a situation.