Need help

So currently just off of the iud paragaurd as of November 19th 2018. Currently trying to get pregnant and it seems as if I can’t. I wasn’t hard with my last child which was 5yrs ago I don’t understand. Mind you I had 3 kids with only 1 Fallopian tube. Last month my period came on a day late and lasted only 3 days. I’ve been have these little flurries in my stomach‼️ I’m confused 😐