Feeling nauseous

Just wondering if it would be too soon to feel nauseous as a sign. My husband and I have been ttc for a year and a half and last month I started taking clomid due to PCOS. I'm supposed to test Monday when period is due. My ovulation window was from 11-16 this month. I've been feeling nauseous frequently throughout the day for about 3 days now and I've been extremely emotional, even more so than usual. I've also had back pain and cramps. I'm running out of patience. 😕