strong feeling i may still be pregnant after abortion

Hi.. I had an abortion a couple of weeks ago due to the circumstances me n my 'boyfriend' were in.. I wasn't sure what i wanted to do so i asked him what i thought n he said it was for the best.. We both fully understood it was the roght thing to do but now i have had it i feel so guilty and so much regret.. I think he blames me too but i have a strong feeling i may still be pregnant.. Im scared to take a test but me and my boyfriend broke up due to it being too hard to deal with.. I think he blames me for going ahead with it.. I feel so down and depressed.. I need some advice.. Please help!!