What kind of mash did you make?
Did you take a hydrometer reading before you pitched the yeast?
I am thinking your mash is going to be fine- I did not start checking the PH of my mash until a few years into brewing and distilling.
I always check the PH of the mash after I mix in my grains and get them stirred in. I’ll adjust the PH as needed at that point.
I’ve been on a 80-20% malted barely to malted rye kick lately. I shoot for a PH between 5.2 and 5.5 on this recipe — I try and get closer to 5.2.
Micro bubbles are most likely fine- that is showing signs of fermentation.
I would just let it do its thing- if you have not taken a hydrometer reading- take one now and write down the gravity. Let it ferment and then take another reading in 7-10 days- at that point it should hopefully be close to 1.000. I would not stress too much about it.