Nausea at 25 weeks?

25+1 week pregnant and I’m feeling like crap today. A few days ago I vomited and felt really yuck and tired for the day. Was fine for a couple of days but then last night I had a really bad sleep and felt a little off... after having breakfast I’ve felt quite nauseas, like vomiting would make me feel better but I just can’t be sick as much as I’ve tried.

Feeling really tired as well, cannot get off the couch.

Is this a normal pregnancy thing? Getting closer to the 3rd trimester sort of thing, or do we think I’ve perhaps got some kind of bug or something else? Anyone else had this?