drfeelgood said:
You can't just go recklessly having sex and just assume that you won't get pregnant unless God wants you to (and vice versa assume that you are going to get pregnant if God wants you to no matter what). If you aren't ready for children, can't afford children, can't raise children, then you have to be responsible and take preventitive measures. If that means condoms, so be it. If that's a pill, patch, diaphragm, whatever, then so be it. You have to do your part.

God's not up there touching wombs at His discretion.
Before you decide what God does or doesn't do, maybe you should read up on the matter.
Gen:20:18: For the LORD had fast closed up all the wombs of the house of Abimelech, because of Sarah Abraham's wife.
Gen:29:31: And when the LORD saw that Leah was hated, he opened her womb: but Rachel was barren.
Gen:30:22: And God remembered Rachel, and God hearkened to her, and opened her womb.
Gen:49:25: Even by the God of thy father, who shall help thee; and by the Almighty, who shall bless thee with blessings of heaven above, blessings of the deep that lieth under, blessings of the breasts, and of the womb:
Deut:7:13: And he will love thee, and bless thee, and multiply thee: he will also bless the fruit of thy womb, and the fruit of thy land, thy corn, and thy wine, and thine oil, the increase of thy kine, and the flocks of thy sheep, in the land which he sware unto thy fathers to give thee.
1Sam:1:5: But unto Hannah he gave a worthy portion; for he loved Hannah: but the LORD had shut up her womb.
Job:31:15: Did not he that made me in the womb make him? and did not one fashion us in the womb?
Ps:22:10: I was cast upon thee from the womb: thou art my God from my mother's belly.
Ps:127:3: Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.
Isa:44:2: Thus saith the LORD that made thee, and formed thee from the womb, which will help thee; Fear not, O Jacob, my servant; and thou, Jesurun, whom I have chosen.
Isa:49:5: And now, saith the LORD that formed me from the womb to be his servant, to bring Jacob again to him, Though Israel be not gathered, yet shall I be glorious in the eyes of the LORD, and my God shall be my strength.
Hosea:9:14: Give them, O LORD: what wilt thou give? give them a miscarrying womb and dry breasts.
Gal:1:15: But when it pleased God, who separated me from my mother's womb, and called me by his grace,
And many more...