Should I buy ovulation tests

My husband and I tried this month several times during my ovulation. I didn't track it well, we just did what my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> app told us to do. Doesn't look like we are pregnant this month. I'm pretty discouraged and I'm wondering if we should try again next month or is it worth it for me to buy ovulation tests? This is the first time we've tried. I have one daughter that is 19 months, she was not planned nor prevented, so we have no idea how hard conceiving will be for us. 

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