As long as we're nit-picking here, 4 months of trying doesn't mean that something is wrong. Most doctors ask couples to try for a year before seeing a specialist (unless the woman is older, then wait 6 months or less).

Take a group of fertile 22 year old women, for example. Each one has about a 25% chance per month of getting pregnant, while trying to conceive. After four months, you can expect that about 30% of the original group still will have not conceived (75% ^ 4). Absolutely nothing wrong with them, it's just a numbers game.

Spreading misinformation like "a bun in the oven within 4 months, otherwise something is abnormally wrong" is awful for couples who are trying to conceive for a few months, and already stressed out enough about it.