My partner is picking on my weight...

So my partner ‘googled’ my BMI last night and has gone off at me this morning telling me I’m overweight and I need to lose weight because it’s unhealthy. I’ve tried to explain weight gain in pregnancy is normal, but he’s not having a bar of it. He’s gotten extremely hurtful, even telling me he’s struggling to have sex with me now because of my extra weight. Mind you, I’m chubby but I’m really not that big, I have huge boobs that literally weight 6kgs on my chest and add on that extra weight to my bmi.

I’m so hurt by this and I don’t know how to react or respond, he’s hell bent on me losing weight and I know it’s not safe.