Hormones maybe?

16 weeks now and I've felt so clingy to my hubby. Normally we go our separate ways for the day to do what we need to and I miss him and we see each other at home or in between errands and work. Well today, I had a terrible time letting him leave the house. No trust issues. I just really needed to be with him longer.. it almost felt like a panic attack coming on when he pulled out of the drive way. I could not let him go. Anybody else sometimes get really attached to their partner all of a sudden while pregnant?