Infertility?

Yvette • Henson 💗
I've been having unprotected sex with my Boyfriend for the past 4 years! I've kept track of when I was ovulating and I haven't got pregnant? I've asked my doctor if I was infertile and she basically told me I'm too young to worry about that right now? that was about 2 years ago when I was younger and I thought she had a point I was still in high school and I wasn't planning on having a baby I was just curious, so I never bothered to ask again, but now I'm getting really worried it's been long enough and I've taking multiple pregnancy tests when I was late and all of them were negative 👎🏼 now to fast forward to last year, in December was my last time getting my period, I've taken 3 pregnancy tests and all came out negative 😞 idk why I haven't got it. Should I go check it out and see an infertility specialist?