Spotting ?

Hey Guys. So i received my depo shot in Jan. Due to get my shot ago sometime in April. I got my shot two days after my last period ended. My last period ended Jan 16. I got my depo in Jan 18. And i haven’t gotten my period. Which i was expecting too. I’ve spotted like a couple weeks ago. Only for a day. And today when i wiped it was like a light pink discharge on the napkin. And in the toilet it look like three little pink clots. Is that spotting. Or should i be concerned. Is this normal ?