5 days DPO and really bad stomach pains ?

Kathy 🌈 • 29 ttc since 2014 3 mcs| 1 ect loss of tube| 1st IVF June19/Mc 8 weeks july19/ FET Oct19 -BFP Nov19 ....Due July/2020 Reggie born 10.07.20 👶🏼
I'm 5 days DPO and I'm having really strange stomach cramps my period isn't due for another week? What is this