Sexy time = hard belly

An
Last night me and my husband had sexy time  and after we both finished and I payed on my back the left side of my lower stomach felt harder then the right ? Has anyone else felt this ? 
I'm not pregnant that I know yet , I've had 3 negatives since last week . My period was super short and light . My Husband said I need a blood test or a check up lol what do you think ?? 

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