Clomid round 1

How high have your mg gotten before you conceived??? I have a new dr now and he is starting me at 50 mg... My last dr took me all the way up too 150 mg and I still wasn't ovulating... I'm nervous about it this time, and afraid it's not gonna work... My husband is so supportive but I need other people's opinions... Plus twins and triplets run on both sides of the family is this clomid gonna triple that chance???