I'm about 8 - 9 weeks pregnant & was bfing my 23 month old. I'm weaning now though, coz my nipples are really, really hurting. Other than that my symptoms are pretty much non existant! That from some one who had severe m/s through more than half of my first 2 pregnancies!
I doubt bfing has made a difference, I think its babies sex here, coz it was similar last time.