8 weeks uterus hardening?

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So I'm almost to my 9th week (by my own calculations) and when I'm standing I can definitely feel it hardened aligned with my hip bones. When I lay down its mostly squish but just now i was poking around and its almost like one side got hard?? Is this weird or is my uterus getting irritated with my poking? Maybe this is a ridiculous question :-) this is my second pregnancy