From what I've heard, Dr Freda Khoo is quite well-regarded and thorough, but her clinic's MC policy does seem to be quite strict, only issuing on the day of your actual visit, which can be frustrating when you're suffering through bad morning sickness consistently. Given that your situation involves dangerous chemicals, it might be worth going back in person and being very specific with her about your working conditions, because a direct conversation about occupational risk during the first trimester may prompt her to issue a longer hospitalization leave rather than just a single-day MC. Some mums find her very accommodating once she understands the full picture, so I'd frame it less as "I feel nauseous" and more as "my workplace exposure is a safety concern for the pregnancy", that tends to carry more weight medically. It's a bit of a trade-off: you may need to make more trips in than you'd like, but if she sees the severity firsthand each time, she's more likely to document it properly.
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