Help?!

I have every symptom minus a positive pregnancy test.
Twingy one sided cramps, Late period, darker nipples, boobs sore on the sides, acid reflux/heartburn that woke me from sleep, and I just threw up.
Wtf why do I have all of this and still a negative pregnancy test? I'm on CD 39, and I never got a clear positive on an opk so I don't know when I ovulated. This is also my first cycle on clomid.