Need advice!!

I'm very new to this app and need help I'm 19 days late for my period and have token a pregnancy test and it came back negative that was early this week plus my stomach feels hard I feel moody in a way and when I eat after words I mistake eating because I'm in pain or it feels like my stomach isn't settling in a way it's hard to explain the feeling but I'm very gasy and have been for almost a week now I need help and advice on what to two senes I've been 19 days late if token two test and both negative I took the 6 days sooner one and the 99 cent ones  if anyone haves any advice or knowledge to this please help