Am I pregnant or is this mirena withdrawals?

Just wanting others thoughts and experiences. There is a bit of a timeline to my situation so here goes....
On Sunday I had unprotected sex- I still had my mirena in. On Wednesday I ovulated and had unprotected sex again. Ovulation confirmed my cervical position, cervical mucus and ovulation cramps. Early saturday I had my mirena removed. Fast forward 7/8 dpo (5 days post mirena removal) i have had brown/light pink spotting on and off for the past 4 days - not much, just on wiping. Cervical position is relatively high and closed. Hpt at this stage is negative. Period is due in 4 days. Could i be pregnant or is ot just mirena withdrawals? Obviously a hpt is a definitive answer but just wanted to see what others think...