Help!!! Do I take the morning after pill?

Ch

I had unprotected sex with my husband last night , we use natural family planning which has always worked. I fucked up , I didn’t think I was so far along in my cycle. I’m ovulating at least that’s what the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says . Will plan b even work ? I have a small baby and daughter now . We aren’t ready for another and abortion is not an option.