Could this be twins? Could I only be 4-5 weeks? Third baby!

My belly is round and getting hard and it’s big but I’m only 5 weeks. It is not bloat for sure. Could it maybe be twins ?? I thought maybe I’m further along than I thought but I had a period so that’s how I know I can’t be further along. I’m normally thin with barely a belly. This is baby #3. My daughter was born 10/2019.

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