Freaking out!! Need advice please

No judgement or mean comments please. And yes we knew the chances and all that.

So I just had my baby 4months ago (baby#2 and we have a 2yr old) I've been feeling off for the last couple weeks and craving Taco Bell like crazy. Well I decided to test and it turned out positive. I'm going today for a blood test before I say anything to my husband. We were NOT planning on a third. I was waiting for my second period but it never showed.(was going to get the iud) My husband has said a couple times that he would be mad and upset. I'm extremely upset and have no clue on what to do. And if the blood test does come back also I have no freaking idea how to tell him. We had issues between us when I was pregnant and scared something will happen. How would or have you ladies dealt with something like this. TIA

***EDIT: This isn't just about my husbands response if I am pregnant and we know the chances and did and didn't take precaution. I guess I need to be more specific. I want to know how you ladies have dealt with getting pregnant so soon after having a baby and how would you break it to your husband? Sorry for the confusion.