Should I be worried?

I recently got married last May , So for over a year my husband and I have been having unprotected sex. I'm not on the pill, have an IUD ,or am taking any form of contraceptives and we don't use condoms, however he does pull out and I use my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>.
We aren't trying to have children right now (if it happens it happens). Many family and friends keep commenting on how they think it's amazing that I am not pregnant yet. This has me thinking… we haven't been trying to conceive but my cousin even commented "you know, anybody would be pregnant right now if they were doing that?"
I want nothing more than to be a mother one day, but does anyone find it weird also that I haven't gotten pregnant yet? 
Do you think that the pull out method could be that effective?