Is it OK to cry in front of your partner ?

My mom passed away when I was 3 years old I'm 21 I still miss her and cry about her once in a while I'm kind of embarrassed to cry in front of others my dad is the only one I ever done it on front of he lives far away now I never see him anymore. It's just me my wife and my sister. I'm 4 1/2 months pregnant with my son I've been really emotional lately I'm more of a tomboyish kind of girl I usually don't like to cry especially not in front of others. I really miss my mom it would be easier if she were here. Is it OK to cry in front of my friends or family ?