Methotrexate:treatment for Ectopic Preganancy 

Got my first one yesterday, with BHCG at 442 what should my levels be at 7 days after for it to show its working? Is it still a 15% decrease so bhcg at 427 or lower?

I got my injection in my arm yesterday they ask you do you want it in your arm or hip it burns

what is the refrence book for this subject?

It works because my wife had that problem twice, j don't know if she will produce . help me with advice.

where on your body do they inject this?

My wife diagnosed with EP. 6 weeks pregnant with B hcg 2000. Our gynaecologist asked to start methotrexate 2.5mg 1 tab daily for 5 days. Do you think this will work. Or methotrexate inj is more reliable??