What's going on with me?

My husband and I have been TTC our second child for about 4 months now, and I feel like my body doesn't understand how to function anymore. I've been more emotional than ever, my body just picks random symptoms to show, and now I'm not sure how to read myself anymore. This app says I'm on the last day of my ovulation period, and I'm curious if anybody knows anything about early ovulation. I get a little emotional when I ovulate normally, but the past three days, I've had tender breasts, worsening nausea and pain when having sex (just like during my pregnancy). Nobody else is feeling sick and my husband and child eat the same food I do. Any input would be amazing. Thank you.