Hindi ko personally na-try yan, but I'd really suggest asking your OB first before taking anything, kasi bawat pregnancy is different and they'll know best what's safe for you and baby at 4 months! A few of my mum friends naman swear by whatever their doctors prescribed, so mas better na marinig mo directly from your doctor kung okay ang Gestanol 200 for your case, they'll have your complete medical history anyway, so mas safe talaga.