It is more likely due to the fact that advertisers have much more data available to them and much better ways to analyze that data now than they used to, so the

It is more likely due to the fact that advertisers have much more data available to them and much better ways to analyze that data now than they used to, so they can send these types of targeted (pregnancy ala Target) ads than they ever could before. Advertisers in the Mad Men days would have done the same if they had the data and tech available to them back then. Don't blame them, it is their job to advertise and they are using everything in their means to make that effective.