35 weeks pregnant...just a virus or...?

So I work nights and get off at 7am. Ever since 5am, I've felt like complete crup. All day today I've had heartburn, nausea, dierrhea (hey pepto bismol! Haha sorry, that tune is catchy) Ive been trying to drink lotsof fluid, I finally got rid of the heartburn. So far I've only been able to eat a cheese stick,3 banana and half a crossiant. I got sick half way through the crossiant :c My dierrhea is mostly liquid (sorry, again tmi) My lower back has also been hurting. And I've been having these abdominal cramps, almost right below the ribs. They've been coming and going all day, last for about 10-20 secs and haven't been ryhmatic, though can be frequent at times... Should I be worried? I'm keeping an eye out for bloody mucous or water breakage nothing yet. Am I just sick or...? If the pain gets worse or more frequent then ill go to the hospital. Or if I dont feel better by tomorrow morning.