34 weeks.. Lazy lazy... Staying out of work

Hey ladies! I feel so dang lazy. I was cramping basically all day yesterday and left work before the end of my shift. Woke up feeling the same and didn't go in.. I believe it's just the added weight because I'm just fine laying down.  Fmla is covering it so no biggie but I feel like I am letting my coworkers down! Anyone else feel guilty when they just can't go in? Am I really that wimpy