My midwife and obs both told me to start taking them around 32 weeks. I bought the tablets and I think it says on the box not to take them before 32 weeks anyway because of contra-indications. I think they are fine to start taking them now My midwife said it can take up to a month for them to start having an effect on the body anyway.
I started both tea & tablets at around 33 - 34 weeks.
Keep in mind that they won't induce labour, they are to tone the uterus. If you were for any reason at risk of pre-term labour I would tread carfeully; otherwise you should be fine to start now.
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