Blood Sugar level question 🤔

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I have not been diagnosed with GD, however due to excess amniotic fluid and a large baby they want me to check my sugar for the next week to confirm or totally rule out GD at this point. My question is that my fasting level is fine, and so is my 1hr post lunch and dinner... The only time of the day I seem to have a higher level (I am suppose to have less than 129, but my levels have been 131 and 136) is my 1hr post breakfast... Any ideas as to why I’m only struggling with this one blood draw out of the four I do every day? Any tips to help with this? For breakfast I have only been eating a small bowl of plain corn flakes with 1% milk... 😩 so frustrating