The bible also says to kill homeless people
If you're referring to this:
If a man will not work, he shall not eat
That's an extremely roughly translated assumption. It says he shall not eat, not to kill them.
and to stone people who work on Sunday
That was before the resurrection of Christ.
You can't believe something because it's in the bible -- the context and meaning is very important.
You're right, but you need to take your own advice. 
But if your quote is close to right, there's another problem. The word "conceive" has multiple meanings:
# To become pregnant with (offspring).
# To form or develop in the mind; devise: conceive a plan to increase profits.
Who's to say it meant the first one? Perhaps He knows them since they were merely a thought? Since He is omniscient (I think?), he would know about it. That doesn't mean it's wrong to consider having a baby and not having it. And I think it stands to reason that the bible passage might mean that.
I think the bible assumes you're not going to overthink every sentence it gives you.
Anything from the Bible has to be taken with a grain of salt. The true meaning is often buried.
My religion (Lutheranism) teaches that the Bible is the absolute word of God, not some philosophical writing. Nothing in it should be taken figuratively.
Here's some other verses I like:
1 Corinthians 11:14 says "Does not the very nature of things teach you that if a man has long hair, it is a disgrace to him."
1 Samuel 17:50 and 17:51 contradict each other. In verse 50, it says David killed Goliath without a sword; in the very next verse it says he killed him with the Philistine's sword.
1 Samuel 17:50 says "So David triumphed over the Philistine with a sling and a stone; without a sword in his hand he struck down the Philistine and killed him." Verse 51 says "David ran and stood over him. He took hold of the Philistine's sword and drew it from the scabbard. After he killed him, he cut off his head with the sword."
Leviticus 15:19 says "When a woman has her regular flow of blood, the impurity of her monthly period will last seven days, and anyone who touches her will be unclean till evening."
(I'm pretty sure I touch my mom in some form every day, and as you said, you can't overthink)
1 Timothy 3:11 says "A woman should learn in quietness and full submission." 1 Timothy, chapter 3 goes on to say that women should not be allowed to teach.
Anyway, let's just make sure we're clear of my point here. My point ISN'T that the Bible is wrong or dumb or anything. My point is that the Bible can't always be taken literally, and as such, you can't prove a point by saying, "Because it's in the bible".
