I do not take flaxseed but do take a variety of other vitamins and supplements (some on lieu of medication) and I am 26 weeks pregnant. The BEST advice I ever got regarding supplements was to KNOW YOUR COMPANY. I take Shaklee because they also have a list of supplements that they WON'T make (i.e. Kava kava). They do not have a flaxseed supplement but I'm not sure if it's because they don't believe in it or because they feel another company covers that area really well.
I would be happy to e-mail them for you! Still, I would not only ask your doctor about it but specifically ask him/her to what extent they themselves have studied in this area. Shaklee has been around since the 50's and is an essentially science/research company. Also, they will send you their research if you want it (which I did initially to give to my allergist). Actually, they FDA has requested to meet with them quarterly to begin discussions on setting standards in the area of vitamins and supplements. Oh, all their products are food based, non-synthetic, no articifical colors or flavors, no animal testing (human trials only), no herbicides, pesticides...I could go on. I have credited their products with allowing me to get pregant comfortably because I was able to manage severe allergies for which I took 5 drugs a day for six years and now take NO medication.
Oh, this was also important for me to know too. The FDA told Shaklee that even if the FDA set standards for the vitamin/supplement industry, it would not be to the degree that Shaklee holds themselves accountable! To me that means that as long as I use their products, I don't care if they are monitored by the FDA or not.
Hope this helps and let me know if you want me to e-mail them!