Possible? Naturally pregnant after a successful IVF??

Is this really Possible? Could I be naturally pregnant after a successful <a href="https://glowing.com/glow-fertility-program">IVF</a> pregnancy? It took us 7 years to get our son and only after 4 rounds of <a href="https://glowing.com/glow-fertility-program">IVF</a>. I had not had a cycle in 2 years since we got pregnant with our son. He is just over 15 months and I just stopped breastfeeding. Plus I just got off birth control and had my first period. My husband and I did have sex around what would be considered ovulation time. And now im late for my period. I figured i would wait another day or so and see if my period shows up before taking a test. Could i just be irregular after just getting my cycle back? Or could i really have gotten pregnant naturally?