Pot smoking and pumping?

o I THOUGHT my breastmilk was done for because the dr put me on birth control pills since they aren't doing the IUD until 12 weeks PP.

...I started my period -_-

And my breastmilk started decreasing..

--I started to get that itchy swollen feeling in my boobs like I should pump.

My question is, can smoking weed affect your breastmilk by pumping?

Should I dump what I just pumped?!

I do mix 2 oz formula 1 oz breast milk! ...idk if that really matters or not?