Maybe this makes me a bad mother, I wouldn't pour it out, but if a bug flew in my drink most likely I would dump it.
I remember the days when I could barely pump any milk and was so afraid my child would starve, so I get that 100%.
This is a little off the question but pertains to breastfeeding and pumping. A trick that worked for me while I was pumping, if, I nursed my son as I was pumping I usually could produce a lot more breast milk than if I only pumped and didn't have him nurse at the same time. (of course I couldn't do this at work, but at home, usually in the morning and when I got home from work, I did)
Good luck, keep us posted on what you decide to do.