In my table, i want the "2" to go right under the "1" in the same cell, how do I do that?

here is my code

```
\begin{center}
\begin{tabular}{ | p{1cm} | p{1,5cm} | p{1,5cm} | p{1,5 cm} | p{8,3cm} |}
\hline
\textbf{Uge} & \textbf{Speciel dato} & \textbf{ugedag} & \textbf{Antal blokke} & \textbf{Aktivitet} \\ \hline \hline
12 & 17/3 & Tirsdag Torsdag & 1 2 & Text \\ \hline
13 & 9C & 19C & Text & Text \\ \hline
14 & 10C & 21C & Text & Text \\
\hline
\end{tabular}

```

\end{center}