Ovulation Test throwing me off

Emily

So I got Negative ovulation test this morning. I peed a second time about 3 hours later and I got a positive test. 🤔Can some one explain this? I’m 12 days after my first day of my period. Any recommendation of which days my husband and I should do the deed. I think I got pregnant the last time on day 16. Thanks!

Thanks for the advice. 😊