Re: Sudden decrease in supply... need help!
There's a couple things you're talking about. First, pumping. You were an overachiever before; it is much more normal to get about 2 oz from a pump. Remember your supply regulates - often around this time - so you are now closer to producing what your baby needs, rather than way too much. That's not much good news for a pumping mom who wants to get the most milk! You might try experimenting with the length of time you're pumping (I got a second letdown around 23 mins), but please also tell us what pump you're using, how often, is the pump used and have you replaced membranes, and any other pumping details you can think of. Increasing supply by pumping takes a long time - at least a week often - so increasing the number of times will usually work but you won't see results right away.
Second, your daughter nursing. When does she nurse and when does she take a bottle? Count her wet diapers; if she has 6-8 in 24 hours, she is getting enough. Again, remember your supply is regulating, so you might not feel full or spray or leak if you used to. She is still getting enough. Fussy might just be normal. When, exactly, does she get frustrated? At latch on? After 5 minutes?
And yes, your period can reduce your supply temporarily. It will come right back up if you let her nurse nurse nurse.
And she is not done breastfeeding, at 4 months! For sure. This is just a tiny bump in the road. Don't panic!
Fenugreek is great; so is eating oatmeal; but you also have to just drain the breast, preferably through nursing, as much as possible.
Hang in there!
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.