Has anyone else out there recieved the 17P injections before??????

I have recently, well starting at 18 weeks, last week, started recieving the alpha 17 hydroxyprogesterone caproate injections.   Seems as though, the baby has really become quite active!  Kicking/punching frequently.  I know/hope that this is a good thing.  They tell me it is.  I just don't know anyone else that has recieved them being pregnant!  So, I'm not sure what all anyone else has went through with them.  I know that it has to be specially ordered, which we did.  It's not real specific on all the different side effects, which I really don't think I have had any, except for the very painful injection site for about 5 days & constipation, which is normal during pregnancy anyways.  I just wish that there was more information out there on this or at least another person I could talk to about it. 

Please let me know if anyone else knows anything.  I've/we've done all sorts of research on this, but not gotten very many answers.  Any advice would be greatly appreciated!!!!!!!!!!!!

Seems as though, my belly has grown quite a bit since the first injection.  Now that I have recieved injection #2, I guess I'll have to keep the belly pics updated & see how much I/we are growing.   Guess I need to post the one from 4 weeks ago & take one for this week.  LOL