Release change of iqama

i came to riyadh two years back along with my husband.  Am a computer Engineer and recently i got a job offer from  PNU through  a agency .they demanded to change the iqama to them but i can keep passport with me. now they are telling to go through a medical check up  .Am pregnant now just 1 month will they deny me  the job saying am pregnant ? really worried pls reply:(

The female employee must not be expecting in the first 3 months of her employment. General rule in KSA unfortunately.