VITAMIN D deficient

Hey, I have been vitamin D deficient since about 2013-2014. I have been on 2000 ui everyday since and I am still deficient . My new OB has out me on a weekly regimen of 50,000 ui. I have not read much I'm pregnant women taking this dose. What I have read was 4000 ui daily (whoch is onky 28,000 weekly)was the highest tested in pregnant women... im scared of the chance of birth defects... I read there's a chance, I am 31 weeks and 3 days so I know he is developed normally as of right now I'm just scared. I am also recently anemic so I am on iron supplements as well as my prenatal vitamins.

I guess I just want to hear if anyone else has taken a big dose of vitamin d. I am going to call the doc again tmr and make sure it's not going to cause damage to my son.