Still no period

Jessica • Married for 10 years. 1 beautiful child with Clomid + Metformin. #2 born 10/2016.... He was our surprise baby. ❤️❤️❤️❤️
I'm over two weeks late. HPT test was negative. Saw my doctor last week who gave me a progesterone shot to either make the baby stronger or induce my period. He also told me to take another hpt in a week if still no period. For the past 4-5 nights I've felt like I'm going to get my period and then nothing. I finally decided to buy another test. Next time I have to pee, I'm testing. I have PCOS and my periods are usually a few days off not weeks off. I see my doctor saturday for blood work. I'm so tired of this yo-yoing.... Anyone else have this? 
I had awful awful cramps the day my period was due and then nothing. Took Clomid 200mg x5days this cycle. My doctor actually told me he's not sure what is going on... I'm hoping saturday he can give me some insight.