Advice!!

Okay so theres a chance that i could be pregnant but really I'm freaking out Because if I was pregnant now it would be my ex partners baby and we broke up at the beginning of August. My period is late by 3 days and I've been sick at least 4/5 days this week. Also i am on the implant but it feels as if it has snapped in the centre nut im not sure. Should I leave it any longer to take a test? And if it's positive how the hell am I supposed to tell my ex 😱 we haven't even spoken since we broke up and he was threatening me and just generally horrible to me, should I even tell him? But then I can't not can I? need advice on so much.