Hallow Dear, During lactational phase, though the periods have started, they may be irregular and so is the egg release. Hence you cannot rely on safe period. Even though he did not ejaculate in the vagina, usually pre-ejaculation secretions (precum) does get deposited in vagina unknowingly. Precum contains some sperms in it which can cause pregnancy. I would not give importance to the menstrual cramps. May be you might get menses in few days. To determine the possibility of pregnancy, the best and quickest option for you is to opt for Beta hCG test on the blood 10 days after the incidence of unprotected sex. Alternatively you may wait for 21 days after unprotected sex and perform pregnancy test on the overnight first morning urine sample; earlier this test may report false negative results. If you are not pregnant, you can take some progesterone preparation like Deviry for 5 days or Oestrogen + Progesterone combination like EP Forte for 2 days. 4-7 days later you will get withdrawal bleeding. If you are pregnant, you can terminate the pregnancy by medicines upto 9 weeks of gestation. For either of the options, you should report to your Gynaecologist; do not take these medicines of your own. I hope this helps you. Dr. Nishikant Shrotri