can't have sex with my husband

Hi girls 
I'm having a problem,I'm 22weeks as of today and had only had sex 4 times throughout the pregnancy. My body felt really heavy and weak so I didn't feel good having sex. But now I feel a lot better, my problem now is that I feel super DRY. So my question is if I can use lubricant. Or is it not safe for the baby?
Please help I'm getting frustrated