Anxiety

I’m 18 weeks and 4 days and I guess I’m having Braxton Hicks. My belly gets really tight and hard for about 20 seconds and then it goes away. It’s not really painful just uncomfortable. It happens a few times but not more than 5 an hour. But I’m just terrified something is going wrong. I’m going to call my doctor in the morning. My husband keeps telling me it’s normal and everything is okay but I’m just laying here crying and scared something will happen and I’ll lose my baby.