TTC But not really...

Hey you guys I’m new to this app I hope this community is accepting and non- judgemental like the Pink Pad community was. Anywho me and my guy been together 6years now out of those 6years we never used a condom. He always pulls out. I just don’t understand why I haven’t got pregnant, we’re not really trying but if it happens it happens. I mean 6years and never got pregnant That make me nervous!! What are your thoughts?