Hello Maam..i Am 25years Old & A Mother Of Two..this

hello maam..i am 25years old & a mother of two..this is my first time to use norifam. for the past 2years, i used pills. yesterday was my last day of menstrual period & also the day when norifam was injected to me at my vastus lateralis. is it ok that it is not injected at my buttocks or at my upper arm? and i am thinking of shifting again to pills because the injection is very painful for me, when should i take the first tablet of pills?30 days after the injection of norifam or even i don't have yet the menstruation? or should i wait for my next menstruation? i am so worried because my husband is not choosing the day when he wanted to make love..