Going for Inj # 4

So I am getting ready to do my 4th Follistim injection and about 1/2 hour ago I started getting crampy like I was getting a period. I was going to call the doctor but its not unbearable just some mild cramping so I guess I will do the shot as normal and hope the cramping doesnt get worse and these injections work!! We went to the doctors yesterday morning and there were 2 follicles already. IO go back on Monday for another US and BW so we shall see......