<s>[INST] Hi I am baby I used petogen injection last year 20th October after I gave birth so I had sex in December and I didn't go to periods is it possible that I could be pregnant but my returning date was 17 January but I didn't go because of not getting my periods? [/INST] Amenorrhoea could be because of petogen effect... As it inhibit ovulation and cause amrnorrhoea due to sustained progesterone </s>