Chart 1: daily chart shows the rising trendline, still projected to be around 18.5
Chart 2: hourly chart shows the first support level at 19.00 has been reached and that the pair is at the bottom of the falling trend channel.
Chart 3: same as 2, but zoomed-in.
Now is probably a good time to exit some or all USDMXN shorts. While the fall from 19.55 to 19.00 is already a hefty gain, the trend for the pair remains up, and I don't like positions that are against the direction of the underlying trend.
Better to take the profits on USDMXN shorts now, and wait for a good opportunity to go long the USDMXN at a later point.