2nd child? Confused. Many questions.

Allura

I’m already a mother, but I forgot how soon it was when I found out I was pregnant,

I wasn’t even <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. So I had my last period March 2nd and it ended the 9th. I had sex the 18th, 21 &22nd. I ovulated 12-18th would I be pregnant? Even if I had sex after those days would I still be able to get pregnant?