Personally I would wait and/or use other pest control methods. For ants you can get ant-rid baits which are borax based and quite effective. For other critters look at your access points, eg maybe keeping your fly screens in good nick can help.
Lemon oil is good for stopping spiders. You can wipe or spray a mixture on your window sills/ledges and around doors. You can use it outside on your eaves and around pergolas. Spiders taste with their feet so won't nest where they taste the citrus.
I personally wouldn't go the pest spraying while pg with a developing bubba in there, a very vulnerable time.
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