How Long Does Petogen Stay In My Blood?

Hi doctor,may I please just ask if its normal for me to experiece the following.I am 21 years of age and I have commenced using petogen on year 2011 but not for long because I still remember I went only three times in a year for follow up clinic injections.but afterwards I decided to stop using petogen as I was gaining weight,then I decided not to be on contraceptives any more up until now.I'm worried doctor because my partner and I have been having sex without use of any protection up until now.so I wonder if the petogen is still in my bloodd system or not