I'd be so pissed! My friend lost her Chihuahua to respiratory distress within a few days of spraying her driveway with Round-Up and I refuse to give the utility companies permission to spray the right-of-ways running alongside my property. Now that I have a child I don't even want her playing in yards that have been sprayed.
Without researching each of the chemicals in depth, the only advice I can give you is to get the soil tested and consider growing in containers this year. I know it will be a pain but it will give you a chance to grow something while you come up with a plan for the future. If you decide on raised beds in the future, the contents of the containers can always added to the beds later. Look for containers along the curb on garbage day and don't overlook buckets and kiddie pools. I know it will still involve bringing in soil which is a hassle when pregnant and can be costly. I currently have an overabundance of pots, flats and cell packs because people know I like to grow things and constantly are dropping them off. I also have several old washtubs and old cooking pots that I've converted to planters, so don't be afraid to think outside the box. If you have access to untreated
pallets and are handy, you can make your own containers and/or beds.
I know 1/4 acre isn't that big, but consider building some
compost bins and put the word out that you're looking for grass clippings, leaves,
wood chips that are from chemical-free yards and start making your own compost. I've never had luck with Chipdrop but the state generally drops piles of woodchips alongside the road and I carted many, many buckets of them home last year to replenish the paths in my garden.
There's also plants which are good at removing contaminants but you'd be growing them as a trap crop and not to eat. Once the particular contaminants are identified, do a search on the plants best suited to removing them from the soil.
I wish you much luck and hope that you'll be able to have a garden this year even if it isn't what you'd originally envisioned.