Anak, this is really something you need to ask your OB agad, hindi dapat mag-self-medicate ng ganitong gamot without checking with your doctor first, lalo na if you're pregnant or expecting labor. Your OB lang ang makaka-assess kung safe para sa'yo at sa baby based sa your specific situation. Better safe than sorry, no? Please call your hospital or clinic and ask them directly, that's what they're there for. Fingers crossed everything goes smoothly for you!