WI Yolande de Dreux's pregnancy doesnot ends in stillborn child?

In 1 Novemeber 1285 King Alexander III of Scotland married Yolande de Dreux (following the deaths of his 2 sons in 1281 and 1283) in order to get a male heir...
However Alexander III died unexpectedely at 19 March 1286 after a fall from his horse... Ironically he was going to visit his pregnant wife...
WI King Alexnader III dies as in OTL but Yolande gives birth to a boy?
Would Edward I of England attempted to annex Scotland or he would support a rebellion? How is this altering History? Any thoughts?
 
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