I don't understand the bar

Sierra
Okay so i have the bar implant and my boyfriend uses condoms every time we have sex what are my chances of getting pregnant I've had the bar for 4 months and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> is saying my period is 14 days late I already took a test last Friday and it was negative but I'm still freaking out about it and trying to remember if we ever did it last month without a condom am I crazy or could I be pregnant