Should I take a contraceptive pill ?

So my boyfriend and I had sex today and the condom broken after a few strokes in a position and he pulled out and as soon as he pulled out , he came everywhere . That’s where we figured out the condom was broken . According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> , I’m not ovulating and my cycle is very short between 19 and 22 days . My period just ended on the 1st of this month and I started ovulating right after according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>. He says there is no way his ejaculation got into me , but I’m scared . Should I spend 50$ on an emergency contraceptive ?