sharp pain...

so last night I got up to use the bathroom and when I sat down I had sharp pain covering my stomach and it was a little hard I got back in bed and it felt like it got worse so I tried changing positions and nothing helped I'm 33 weeks+3 this is the second night in a row where this has happened. I don't know what it could be.. like am I getting one very strong Braxton Hicks because it don't happened during the day