I'm not sure if you are aware of this, but the only shot recommended during pregnancy is the flu shot. I see a naturopath instead of an MD, and am using a midwife this pregnancy instead of an OB, and they both (as granola as they are) still recommended a flu shot. That said, you probably have very different opinions about immunizations in general and I hope I am not sounding offensive.
I grew up in pools almost half my life! I never caught anything that was "going around" from the pool. Then again, my family always seemed to buck the majority of the colds and viruses that went around our schools. The worst I ever experienced was a plantar's wart on my foot after attending swim camp at a university one summer!
I think a lot of what people deal with health-wise is just the constitutions we are born with. My daughter is a formula-fed (not my first choice!), day care kid, and has had one cold in her two years alive. I have friends who breastfed exclusively til one year, stay home, and their kids are sick several times a year. But, their moms or dads seem to catch every little bug too. My husband and I both work in schools and are exposed to a lot of icky bugs, so perhaps all of our previous exposures have helped "immunize" ourselves and some of that was somehow passed along to my daughter?
Have you researched potential side effects of the flu shot? Is there even a flu bug going around the PNW right now? I know one of the concerns we had about immunizations was knowing that there are large immigrant communities in the Northwest and many of them have not followed immunization schedules. The potential for outbreaks being serious in our part of the country is greater--in which case if you are near any of those communities you should exercise caution.
In the meantime, get out with your little one. Eat healthy, wash your hands, get your rest and enjoy life! We take our daughter swimming pretty frequently and she absolutely loves it! Just wear your flip flops to avoid the floors ;)