Surprisingly no. At least in central and western Europe, child marriages were very much a nobility thing. Securing alliances and such. And even for those the first child may well have been much later.
I don’t have an individual statistic on hand but https://fakehistoryhunter.net/2026/01/18/age-of-marriage-giving-birth-in-medieval-europe/ has collected a bunch of sources that suggest that the usual age of first marriage in medieval Europe for women was around their mid 20s, pretty much the same as today.










Read the page I linked. It specifically lists sources that specifically talk about peasants in medieval Europe who on average married later than nobility.
Prom night conceptions and shotgun weddings are a phenomenon of the 20th and 21st century and would have been considered absolutely scandalous for most of history.