Is that the baby kicking?!?

Irene • Due date Aug ‘18 but she came July ‘18 🙌🏾🙌🏾🙌🏾 Late Term Preemie 💕🌈💕

Tomorrow I will be 20 weeks. I’ve been feeling these “thumps” in my lower abdomen. Sometimes I wonder if it’s the baby but then I pass gas like 15-30 mins later. Other times, I feel those thumps and pass nothing. I’ve been feeling them ALOT these last 3 or 4 days. I’m a ftm so I don’t want to get too excited if it’s just gas 😂 but I have a feeling it’s the baby. When did y’all feel your first flutter or kick and how did you differentiate between the two?