Some of these suggestions may not be applicable during pregnancy since your cause is different than mine, but you can decide what you can safely investigate and what is applicable for you.
I developed a bulging disc between lumbar 4 and 5 by running too much on the jogging trail. I'll tell you what I did.
1) My chiropractor recommended taking daily doses of 100 mg. of Vitamin B6.It strenghthens nerves. I noticed an improvement in 4 to 6 weeks.
2) Aleve is a good NSAID medication that is sold over the counter.
The doctor can prescribe a stronger form of the drug in the name Naproxen.The doctor can also prescribe Tramadol which is a narcotic and good pain reliever.
Back ice packs are a good idea also.Usually they can be placed around the waist area for the best relief.
(They connect with velcro) You can buy them at most pharmacies
-- example at the site below:
http://www.shapeupshop.com/fitness/recovery/ice_heat_wrap.htm
3) The lunge exercise is good for sciatic conditions.
An example is at the bottom of this site:
http://www.halhigdon.com/15Ktraining/Strength.html
4) I bought the Teeter inversion table. You can invert yourself partially
or completely for spine decompression. It feels great.
It costs a few hundred but I like it.
http://www.teeterhangups.com/home.html
5) I purchased the Rebuilder 2407 Electronic Stimulator (information at the site below).This product was intended for a variety of ailments including nerve damage due to diabetes but I found it helpful when the electrical attachments are placed slightly to the right and left of the spine where the bulging disk occurs. In my case,
just slightly lower than waist level to the right and left of the spine.
They want $699 for this, so it's something to consider even though it's a little expensive. I bought the more expensive model since it had the AC adapter associated with it rather than just the battery (and so it supplies more power). It definitely makes you feel good when you use it at 7.83 Hz.
http://www.rebuildermedical.com/