I have a 4 month old baby and I was breastfeeding and taking ...

Doctor I have a baby of 4 months I had her cesaria, I breastfed until the 3 months, in December I started to take contraceptive itself for the one who is breastfeeding the next month I stopped breastfeeding and finished the medicine as in the same way I stopped taking the contraceptive because no longer breastfeeding, my husband does not use a condom and for 2 months we had a relationship with him enjoying out and now my menstruation has not gone down, it's been a week since I was late and I took a pharmacy test 3 days later but it turned negative, I may be pregnant again doctor Even my daughter having only four months and my surgery being recent? Am I at risk on account of this?