trying to conceive (my sister)

So my sister is a week late and has irregular period but she has been taking fertibella conceive easy for lil over a month and still hasn't started. The only problem is she is getting positive ovulation test. She has taken three all at different times. Has anyone had this happen and what were the results. All pregnancy test are neg.

About Sonya Puentes
Current: Greeley, Colorado
Birth: October 04
On since: May 1, 2014
I'm 29 and pregnant with mine and husband's first!! After several heartbreaks we are finally 6 months pregnant. So grateful and excited to bringing our rainbow baby into this world in Aug.