Symptoms or side effects??

I started my first round of Clomid cd 5-9 and never had any side effects. I'm on cd 20 now and I've been having hot flashes, nausea and have been feeling fatigued and moody the past 2 days. Could this be late side effects or early pregnancy symptoms?? I get my blood work done tomorrow but I'm sure I won't know anything until Monday. Should I wait on the results of that or take a pt? Or is pregnancy still too early to detect??