Could I Possibly Be Pregnant? It Feels Like Something Is

Could i possibly be pregnant? It feels like something is in my stomach moving around sometimes.. I've had the nexplanon implant for 2 years now. I've had some irregular periods but they've been on time lately. Last month i didnt have a period at all, i was 36 days late for my period. the following month i had my period than stopped now having another, one. Its heavy sort of.