Worried.

As of right now, I'm not trying to conceive but I have a sort of "whatever happens, happens" idea when it comes to pregnancy. We don't use any method of birth control & my SO does cum inside me sometimes. I know this app isn't always 100% accurate but there has been a lot of times that he has came inside me, some even when according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>, I am fertile. Sometimes when I log my periods my past fertile week changes to the week after/before and we use <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> to track when I'm fertile so we can know when to be really careful, but it doesn't make sense that I haven't gotten pregnant whether he cums in me whether <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says I'm fertile or not. It just worries me that I haven't accidentally conceived during any of these times, it makes me feel like I might have trouble conceiving when I'm actually trying. Should I have this worry?