Puis-je avoir du MTP pendant l'allaitement lors de la 2ème grossesse ?

Sometimes, light blee­ding around menstruation can happen due to implantation. This is whe­n a fertilized egg attache­s to the uterus lining. Not eve­ryone experie­nces implantation bleeding, but it's possible­. No need to worry exce­ssively. However, if unce­rtain, take a pregnancy test for re­assurance. Stress also impacts menstrual cycle­s. 

Pregnancy is unlikely. Your period on the 29th would have been too early for implantation bleeding . Bleeding on the 2nd of this month could be hormone related, due to stress, or a vaginal infection. See your gynecologist for an evaluation and some blood and urine testing.

Periods can  be delayed not only due to pregnancy but also other factors like stress and anxiety, etc. Try a pregnancy test if you're concerned.. if the test is negative then visit a gynec for irregular periods problem.

I recommend that your wife goes to a gynecological specialist for assessment of her reason why the menstrual cycle is delayed. Late periods may be caused because of pregnancy, hormonal imbalances related to stress or by some other medical complications. The diagnosis will allow a gynecologist to offer the necessary guidance and treatment.