Am i pregnan

Patient: Im 20 years old and want a baby i been on the injection since i was 16 bt came off for 7 months bt had one injection a few months ago my next one was due on the 5 of aug bt i didnt have it and 3 days after came on my period i was due on again a week ago bt have not come on and have been having pregnancy symptoms is it possible to become pergnant so soon after stopping the injection