Every month my sister (26) gets her period and she swears up and down she is pregnant. “It’s just implantation bleeding!” “Pregnacy tests don’t work on me” I just have to make my ob give me an ultrasound” ( even though they always come back neg)

This goes on and on every single month for the past year. Then she cries after three or four months and says she lost her baby. But the next month she is back to swearing up and down she is pregnant.

I found out I was pregnant today, because I had fallen off my horse, and my boyfriend made me go get my head lac looked at. I’m 8w4d. (Everything’s fine with us but I have a small SCH)

I am nervous about telling anyone because my sister cries wolf EVERY month.

So I called my mom and my sister happened to be in the car with her. Now my sister is over the moon because “we were destined to have babies together” my mom actually sounded excited about a baby and looks happy for a change, when we met up for lunch. I am 24, and scared of my big sisters habitual lieing and me potentially getting whiplash from it.

What should I do?