And we are ALL entitled to the opinion of the Doctors of the Church who carry more weight then idle speculation. From the Summa:
"On the contrary, Augustine says (Serm. de Nativ. [Supposititious), addressing himself to the Virgin-Mother: “In conceiving thou wast all pure, in giving birth thou wast without pain.”
I answer that, The pains of childbirth are caused by the infant opening the passage from the womb. Now it has been said above (28, 2, Replies to objections), that Christ came forth from the closed womb of His Mother, and, consequently, without opening the passage. Consequently there was no pain in that birth, as neither was there any corruption; on the contrary, there was much joy therein for that God-Man “was born into the world,” according to Is. 35:1,2: “Like the lily, it shall bud forth and blossom, and shall rejoice with joy and praise.”
Reply to Objection 1. The pains of childbirth in the woman follow from the mingling of the sexes. Wherefore (Genesis 3:16) after the words, “in sorrow shalt thou bring forth children,” the following are added: “and thou shalt be under thy husband’s power.” But, as Augustine says (Serm. de Assumpt. B. Virg., [Supposititious), from this sentence we must exclude the Virgin-Mother of God; who, “because she conceived Christ without the defilement of sin, and without the stain of sexual mingling, therefore did she bring Him forth without pain, without violation of her virginal integrity, without detriment to the purity of her maidenhood.” Christ, indeed, suffered death, but through His own spontaneous desire, in order to atone for us, not as a necessary result of that sentence, for He was not a debtor unto death.
Reply to Objection 2. As “by His death” Christ “destroyed our death” [Preface of the Mass in Paschal-time, so by His pains He freed us from our pains; and so He wished to die a painful death. But the mother’s pains in childbirth did not concern Christ, who came to atone for our sins. And therefore there was no need for His Mother to suffer in giving birth."
Mary had no birth pains since first her pains did not concern Christ and second-there was nothing to be gained by her pain.
I like this opinion from the Church much better than mine or yours.