Pregnancy scare

My last injection of the depo shot was February10,2016, I was supposed to go back for my next shot early in this month(April) but I didn't, because I do want to be able to conceive one day. I had unprotected sex with my boyfriend April14 & the very next day(April15) I started spotting & have been spotting everyday since then up until now. Some days it's light some days it's normal, I never fill the whole pad. No symptoms other then eating & sleeping a lot, should I be worried or is that normal? PLEASE FEEL FREE TO COMMENT