[Lizzie]

Seeing as she is 18 she doesn't need her mother to take her to the doctors and get any kind of birth control. If she is not making the appointment and going to get birth control pills that is her problem, not her mother's. So blaming her mother is not fair in this situation. Your partner is an adult and needs to take her own sexual health seriously. If she can't make an appointment on her own, and attend that appointment, then she doesn't have her priorities straight. Perhaps you two should hold off on having vaginal sex until she is mature enough to get her own birth control.

But the most important thing to do, would be to make sure she is not pregnant. Some women experience little to know symptoms of pregnancy, so a lack of morning sickness or breast growth is not a good way to determine if she is pregnant or not. The fact that she has missed two periods in a row is the most worrying sign and she needs to take a test. If she doesn't want to go buy a test, pick one up for her at the store and bring it to her. The sooner she knows if she is pregnant or not the more time she will have to decide about her options.