Heyyy ladies

Soo I have been having sore boobs for two weeks now..and I have been cramping and and having back pains like my period coming for a week now... Still no period...it. Suppose to came on the 18 but no period still... All BFN...I couldn't tell you when I ovulated and I did take start taking a new drug called fertibella but my Dr told me to do BC pills again for 3months due to my irregular periods...now I'm just lost...should I get blood work or just wait it out... ????