Question about Labetalol.

I was taking 200mg twice a day and now
I take 300mg twice a day. 
I know it's safe for women who are pregnant or trying to become pregnant. We've been trying for a year and half, I am still not pregnant.
My milligrams were recently increased and I'm just worried if I do become pregnant, is it truly safe? I'm also taking garlic pills & magnesium vitamins. 
I'm not overweight, I don't smoke or drink. I've had test done and everything comes back normal. My high blood pressure has been really crazy and it worries me. I know high blood pressure runs in my family.