While everybody is correct you won't go to jail if you're guilty, that's true. I have two DWI's and only had to do a weekend jail on my 2nd one and probation for 2 years for each but, after the 3rd one it gets serious. I learned my lesson and don't do it anymore but, the thing is that it is NOT just $2-$3k you'll end up spending like in Texas they teach you in the mandatory classes you have to take that after lawyer expenses, fees, surchages, restitution, etc. it's more like in the $20K range. I still remember that day in class, they ask each person in class how much they paid for their attorney, and they go through it all and tell you how much it will cost you, and they do some kind of comparison to tell you how much less expensive it would have been for you to take a cab instead of driving under the influence. I'm still paying monthly surcharges until August of next year for my DWI in 2008. Just my surcharges amount to almost $2,500 over the 3 years.
You definitely want to fight this if you're not guilty, it will be on your record and that's just the beginning, going through the shit they make you do is not fun, it's a lot of shit it's a lot of classes of all different kinds to "help" you, community service, monthly meetings with your probation officer, all kinds of fees to probation and restitution, in Texas you pay surcharges to the state for 3 years, shit load of paperwork, to me it was like having a part-time job, AA meetings (only had to on my 2nd but, could vary from state to state) it's pretty much designed to make you fail. Seriously somewhere down the line, you'll start wishing they just gave you jail time instead, some people do that end up exchanging jail time instead of completing probation.
If you really were sober, and he took your blood then I don't see how they can find you guilty, the proof is there in your blood. Of course contact an attorney asap but, it should be an easy case for them if you were really sober and they took your blood it's right there on paper that you weren't under the influence, plus they have cameras on the police cars, I didn't read did he make you do sobriety tests like do the alphabet backwards, or walk in a straight line etc. ? If you passed all that they can see the video, the judge and in court they can see that if you didn't look or act drunk that will count in your favor. My attorney wanted to see the video on my second DWI he said if I didn't look drunk they could maybe fight it but, he saw it and said fuck no lol there was no way i was way too wasted and looked it on the video, so had to plead guilty.