It depends.

Is it sometimes wrong? Yes.

Is it always wrong? No.

Here are some helpful recent resources (best overall = Grisanti):

1. Alcorn, Randy. Does the Birth Control Pill Cause Abortions? 10th ed. Sandy, OR: Eternal Perspective Ministries, 2011.
2. Burk, Denny. “Glorify God with Your Family Planning.” Ch. 5 (pp. 139–55) in What Is the Meaning of Sex? Wheaton: Crossway, 2013.
3. Davis, John Jefferson. “Contraception.” Pages 27–67, 291–97 in Evangelical Ethics: Issues Facing the Church Today. 3rd ed. Phillipsburg, NJ: P&R Publishing, 2004.
4. Driscoll, Mark. “Question 9: Birth Control.” Pages 15–43, 263–66 in Religion Saves: And Nine Other Misconceptions. Re:Lit. Wheaton, IL: Crossway, 2009.
5. Feinberg, John S., and Paul D. Feinberg. “Introduction to the Ethics of Human Sexuality: Sex and Birth Control.” Ch. 6 (pp. 267–306, 767–71) in Ethics for a Brave New World. 2nd ed. Wheaton: Crossway, 2010.
6. Frame, John M. “Birth Control” and “Means of Birth Control.” Pages 782–87 in The Doctrine of the Christian Life. A Theology of Lordship. Phillipsburg, NJ: P&R Publishing, 2008. Cf. Doug Moo’s review of this book.
7. Geisler, Norman L. “Birth Control.” Appendix 4 (pp. 396–405) in Christian Ethics: Contemporary Issues and Options. 2nd ed. Grand Rapids: Baker Academic, 2010.
8. Grisanti, Michael A. “Birth Control and the Christian: Recent Discussion and Basic Suggestions.” The Master’s Seminary Journal 23 (2012): 85–112. Grisanti is an OT scholar with 8 children.
9. Hollinger, Dennis P. “The Ethics of Contraception: A Theological Assessment.” Journal of the Evangelical Theological Society 56 (2013): 683–96.
10. Köstenberger, Andreas J., with David W. Jones. “Contraception.” Pages 121–29, 336–38 in God, Marriage, and Family: Rebuilding the Biblical Foundation. 2nd ed. Wheaton: Crossway, 2010.
11. Mohler, R. Albert, Jr. “Can Christians Use Birth Control?” AlbertMohler.com, May 8, 2006.
12. Perman, Matt. “Does the Bible Permit Birth Control?” Desiring God, January 23, 2006.
13. Piper, John. “Should Christians Use the Pill?” Ask Pastor John. December 5, 2013.
14. Rae, Scott B. “Birth Control.” Pages 286–89 in Moral Choices: An Introduction to Ethics. 3rd ed. Grand Rapids: Zondervan, 2009.
15. Storms, Sam. “Birth Control.” Enjoying God. June 12, 2006.
16. VanDrunen, David. “Marriage, Procreation, and Contraception.” Pages 97–117 in Bioethics and the Christian Life: A Guide to Making Difficult Decisions. Wheaton, IL: Crossway, 2009.
17. Wheat, Ed, and Gaye Wheat. Intended for Pleasure: Sex Technique and Sexual Fulfillment in Christian Marriage. 4th ed. Grand Rapids: Revell, 2010. See pp. 162–94.
18. Wilson, Douglas. “Eleven Theses on Birth Control.” Blog & Mablog, 16 February 2011.