Can I be?

I know it’s really early and please do not judge me by this post. But we started trying to convince this month I’m in my ovulation window this week. We’ve had sex for the past three days (trying mode) and today I’m just feeling so sick. I know how long I am supposed to wait to take a test and how long the egg takes to fertilize. But is it possible to feel symptoms this early or am I just crazily imagining this???