Let Down Question

Sawyerplus1

Is it normal, once your supply has more or less regulated, to not feel the 'let down' sensation anymore, or at least not as strongly?

Nursing my 10 day old has been going really well right from the beginning, but for the past day or so I havent noticed feeling the 'let down' at all when he nurses. I can still hear him swallowing, so I know he's getting milk, and his wet and dirty diapers are numerous, but I had serious supply issues with DD and so I'm feeling more nervous this time. I feel like without the let down he's not getting as much as he was. 

 Also, it might be worth noting that I was just diagnosed with mastitis in one breast, so can that affect my supply?