Vaginal care

Hi I’m 32 years old my bf is 29. I have a son he’s 13. After I had him I got a iud for 8 years. Been practicing safe sex until I got with my bf. We have sex but he doesn’t all get the big nutt (tmi) I really wanna get a BFP. I starting to believe I need to regulate my cycle. So I starting taking prenatal vitamins for before during & after pregnancy. Been taking them for about 30 days my period is 11 days late. Took two pregnancy tests both negative. Should I try a fertility booster ??