I lied about my race to my boyfriend now idk what to do?

Well I didn't really lie, I just left out the fact that I am half Black. I always do though, I always tell people Im just Dominican. Not because I dont like black people or Im ashamed, just because I don't consider myself black. I don't look black, I speak Spanish, I look 100% Dominican, so when we first met I told him I was 100% Dominican, & just left it at that. No big deal. I didn't lie to cover up my african-american side, I just said that because thats what I'm used to - BUT NOW im pregnant with his baby girl (we're so happy) & I realized something - he only met a few of my relatives - who are black from my black side. & on top of that, I was raised by my black side since i was 3, so the only family I talk to are my black ones. Since im pregnant by him he wants to be around my family more which wouldnt be a problem except for the fact that i dont want him to find out im mixed with black & then think or question if i lied to him the whole time ... HELP???