Help me explain pregnancy to my husband!

I just found out I am pregnant 2 days ago. I am estimated 4 weeks 5 days. At night I've been feeling pain, have to use the bathroom at lease once, and wake up alot during the night. I've been sleepy during the day too. When I was telling him that "alot is happening in my tummy at night" he says "don't you go blaming being pregnant" he thinks nothing is happening bc we just found out... I try to explain it to him but I don't think he understands.