In a way, I feel I should not reply to this question. I am a nurse and I am mindful about giving professional advice on this matter. I have decided to respond from a woman's and mother's perspective only. It is really an impossible question. Pregnancy is so non straightforward and how does one anticipate how it will go for you. Certainly in a normal pregnancy with a healthy woman and baby, some basic daily walking is likely to be beneficial. Walking 20 km or so a day, if this is what you plan, using a considerable amount of energy to keep your body going, possibly at the expense of the baby, carrying a pack which puts pressure on your pelvis and lower abdomen may not be that great. Your joints all become more flexible and loose. Falling over on steep and or slippery ground is not at all unlikely. It may all go really well, but what if it did not, how would you feel if you developed problems? It will take time to get to proper treatment facilities. What if you ended up with complications, such as a spontaneous abortion or if your baby was compromised in some other way. How would you feel?? You may never really know whether the walk was the cause or not, you would have to live with the consequence of having put yourself first.
I had a few drinks early in my pregnancy before I knew I was pregnant and my daughter who is now 17 was recently diagnosed with attention deficit disorder and dyslexia and has been through adolescent hell. I will never know whether these few stupid glasses of Gin caused the problem and I will have to live with this doubt for the rest of my life. If there is any way I could wind back the clock and not have those drinks, I would. Had I known I was pregnant I would never have done this and I did not drink at all from the time I had a positive pregnancy test. It just is not worth the risk. The Camino of course is not alcohol, but it is addictive in it's own way and can lead to other excesses, like walking beyond one's capacity, for example challenging terrain, weather conditions, heat, cold, wind, rain, snow, lack of food or water etc. From what I know of the Camino, I personally would not walk it as a pregnant woman. I don't know about you, but I had to really adjust to my maternal side. I was 38 when I had my daughter and had been a career woman and worked right up to when my daughter was born. In a way I missed out on the finer details of the experience. It is good to slow down and be still at this time. It is quite special. Hope you will find a way of making a decision that feels right for you. Warm regards, Gitti