Starting clomid

J
Hey ladies! I'm 34 YOA, hubby is 37. Been married for 2 years, together almost 6. I was on BC for at least 12 years. We've been ttc for almost a year now. My dr thinks that I'm not ovulating due to low progesterone. Although, I'm sure that I'm ovulating since I'm getting regular positive OPKs and can feel cramping around ovulation time. 
I start my first cycle of clomid tomorrow. I'm pretty nervous about it. Any advice/tips are much appreciated. What can I expect?