I've been on a pill for at-least a month just started my other packet 3 days ago.

I've had unprotected sex with my boyfriend after I finished my period and what the chances of me being pregnant even if he didn't ejaculate? I know the pre-ejaculate issue but, I heard stories like if I was on a pill for a month I'm protected or even if I was on a pill and he didn't ejaculate I'll still be pregnant? Which I find hard to believe... The true outcome when you have unprotected sex and on a month pill?

Once you are on the pill for a month you should be protected. Notice I said SHOULD.

The pill is not 100% effective after you have taken it for any length of time. I took mine religiously at the same time every single day, you could have set your alarm by me. I now have 2 grown sons.

Two forms of protection would be better if you are not ready to get pregnant.

I've had friends get pregnant while on the pill. At the very least, use a spermicide. Walmart and CVS carry a variety. I personally like the Ortho options from Walmart.

Yes, most people know dozens of people who became pregnant while on the pill, the plain fact is it is not 100 percent effective.

So even if the pill was in full effect ( which it should have been)
Every time you have sex even if he does not finish, you can still have a slight chance of being pregnant anyway. Not a big chance but still a chance.