I'm 15 weeks Preggers tomorrow!! I need to know is it normal to feel pressure down there this early…

I'm 15 weeks Preggers tomorrow!! I need to know is it normal to feel pressure down there this early in the second trimester!? When I say I don't really remember the cramping from My other pregnancies I really only vaguely remember. Please help a Mama out!! It's very uncomfortable, plus I walk like 2 1/2 hours with Hubby today and I'm hungry and exhausted but this doesn't feel like hunger pains. It's feels like My Baby is sitting on something and won't move. On a bright note I got My diet coke and Limon Chips and laying down!! Also I don't feel this crampy feeling all the time just here lately as I see My tummy is getting bigger which seems like every week!!