How do I tell my mom that I haven't had my period in 4 months the first thing she will think is that I'm pregnant but I'm not pregnant and I'm not getting big or anything

How do you know you are not pregnant, have you taken a pregnancy test?

Are you having sex ?

But let me see, there is 100 reasons, from infections, to STD and more.

You just tell her, as a women she knows all the reasons , or should

Yes I am having sex but we use condoms every time and when should I tell her?

For years I have said that condoms have a 3 to 10 percent failure rate. But I have learned today from the Planned Parenthood web site that Condoms have a 2 to 18 percent failure rate.
That 18 percent of people that use condoms as normally used, will end up pregnant.

So just using condoms is no reason to think you could not be pregnant.

But now is a good time to tell her, to let her make a appointment at the doctor

OK but I'm really scared

How old are you?

16

Condoms are not a 100% effective birth control device, nothing is. It is entirely possible that you are pregnant. You need to tell your mother.

As a parent of a young girl I would also want to know ASAP. The sooner you tell your mother the better. Don't lie about it.

Have you purchased a pregnancy test, use it first thing in the morning as soon as you wake up.

Tell your mother if you are pregnant you need to see a doctor and get started on a healthy live style. There is lots of reasons you may not be having a period. Stress will cause it, an infection. Don't mess around with your health. If you can't tell your mom, tell your friends mom, tell a special teacher at school. But please tell someone and ask for help.