Eating meat:

If a pregnant woman feels weak or sick she may be lenient to eat meat during the nine days.[1] [However, this only applies if other foods cannot supplement the benefits received in eating meat.] Nevertheless, the custom is to be stringent beginning from the 7th of Av[2], unless she feels a strong need for it.[3] Practically, this matter of pregnant women eating meat during the nine days is to be given to the discretion of a Rav in order so people don’t come to belittle the matter.[4]

[1] Shaareiy Teshuvah 551:28

[2] M”A 554:9 regarding a Yoledes; M”B 551:61; Piskeiy Teshuvos 551:41

[3] Kaf Hachaim 551:147

[4] Shaareiy Teshuvah ibid; Kaf Hachaim 551:147