Any advice appreciated 😊

Ashley
Fiancé and I avoiding pregnancy on gianvi/vestura. Taken regularly. No condoms and no finishing inside me. 
Period was WAY lighter than normal but came at correct time (maybe a day early)  Pretty much discharge looking but brownish red and lasted 4/5 days. 
Since then I've been cramping and having lower abdomen pain so bad! Like constant pressure. Nauseous on and off (not just in morning) 13 days until I'm due to start again... 
Any ideas on why I am in pain?Â