Light period, severe cramps.

So my period is due in 3 days. But I started spotting light pink today after I took this PT. Well anyways I bleed light pink a bit not much haven't had any clotting rarely had to change my pad. But the cramps I had over it was extremely painful. They started to worsen within an hour of spotting and lasted about 3/4 hours and they made me so nausoues I actually threw up from so much pain but now I'm feeling so much better and have minor to no cramps now although I still have light pink when I wipe. Help!?!?!?