Looking at some numbers, we have the fetus at 2 months at around 1 gram of weight. It is estimated that the lethal dose of sodium chlorite is around 100 mg/kg of body weight, so 0.1 mg of sodium chlorite from Miracle-Mineral-Supplement could be lethal to the fetus. 0.1 mg of sodium chlorite from Miracle-Mineral-Supplement is about 0.058 drops. Remember, this is the speculated lethal dose...
If you can figure out a way to measure very small amounts, you may consider starting out with less than one hundredth of the lethal dose. This would be around 0.0058 drops, but you should probably be lower than this.
Since we don't know how MMS works inside the body, and since it is extremely difficult to measure these small amounts, and since so much is at stake, I still suggest that you look elsewhere and leave MMS alone.