hi...sometimes we need those "carry blinds" to survive...we need something to depend upon.it gives some sort of a positive energy to your thoughts,though not fully.so some people believe in all these things.let them do.tradition and scientific development can be seen as two sides of a coin.tradition does not seem to prevent information because people are educated now and they know everything.but still sometimes it happens like that people need something to depend upon when they are in utter frustration,anxiety,depression etc.as you said we are human beings not robots..thats why when we experience these kind of emotions we search for some thoughts,not necessarily astrology anything,to depend on.whether the response is positive or negative we will come to know that theres somebody who gives attention to you.its the most important thing.
the second thing is that in my life whatever happened is already predicted by an astrologer.now i live in some other place.i saw u wrote about people who asks about how their partner will look like etc..definitely a good astrologer can predict the place of your partner,his complexion,height etc...not only about your partner he can say about your mother,father and siblings.so we, who trust in that, give importance to it.
thirdly, u asked about how will be my action in january if an astrologer tells you will have a child in september.it does not means that u have to conceive in january itself to have a baby in september.if u deliver in ur 7th or 8th month ,theres no need to be active in january

...now answer to your question ..if its a good time for conception we have to do whatever necessary at that time.mostly a good astrologer can tell you about the time of your conception...if u have any medical problems ,then u have to consult a doctor and do whatever needed.its not the mistake of your time,but a denial from the part of your body.at that time medicines come to your rescue.
so we cannot avoid either science or tradition..both will go together.because our culture and tradition live in our blood.everyone depends on these kind of things at some point in their life because they have to live..a faith is needed.