Metformin vs Clomid??

Does anyone have opinions on one vs the other?  I have been on metformin for a little over a month now and have lost 5 pounds.  This is slightly concerning because I am not overweight and do not want weightloss to interfere with TTC(not sure if it would or not). Met also often makes me sick to my stomach but it has helped a lot with the emotional roller coaster my hormones were on since coming off birthcontrol late May.  I've heard that clomid can help with achieving pregnancy faster and I am wondering why my dr put me in met instead of clo since I don't need to lose weight. Does anyone have any input?  Any info would be much appreciated!! :).  If you read this, sending baby dust your way!