CaedensMama,
if it is a growht spurt, and at 11 weeks, I would bet it is, go ahead and let him nurse as often as he needs. After a few days, it usually lasts 24 hours up to a week, he will be back to his regular nursing pattern.
It can be also a combination of your low supply because of return of period and a growth spurt. Either way, continue to nurse, it will increase your supply.
If it is only a period issue, which at this moment, I think it is not, your baby will go back to his schedule faster than during a growth spurt, just my opinion.