Welcome to HCM.
Your baby is now two & half months old. If your baby is on Exclusive Breast Feeding (only breast milk and nothing else),then chance of pregnancy
is very less more likely 1-2% with unprotected sex.
EBF is mandatory for baby at least first 6 month of age and mothers are always with amenorrhoea (Lactational amenorrhoea).
You are present with lower abdominal pain
6times a day following unprotected sex.After that you notice light bleeding or spotting.
It may be due to hormonal
imbalance or early implantation
. So you have to do a Home pregnancy test for hcg to exclude possible pregnancy.
Check the result and consult with your doctor.
Also you practice safe sex in this time period of EBF by using Progesterone
only pill(POP) or condoms or other measures.