No energy

So my husband and I are TTC and today I feel like I have 0 energy. I just want to sleep and even with me taking my energy boosting multivitamins and eating healthy. I feel like I'm moving as fast as flash (zootopia joke). I ovulated last week and before that I was really energetic and able to clean my entire house, but right now I feel like taking a long nap! Any suggestions on what to do? I feel like I may be pregnant because I do feel slightly nauseated as well, but it would be way too early to take a test!