Sudden Weight Gain

I've lost 20 lbs in the past few months. After my second round of IUI with clomid and ovidrel, I gained 12 lbs in the past two weeks. I have no idea what's going on. I asked the nurses at the fertility clinic today during my baseline testing, but they just told me to go see my PCP. I know clomid can cause weight gain, but 12 lbs in 2 weeks is just crazy. I didn't change anything with my diet, and I religiously track food with the WW app. Anyone else ever had this happen?