7 Ina half months
First Trimester :
Month 1: 1-4 weeks
Month 2: 5-8 weeks
Month 3: 9-13 weeks
Second Trimester :
Month 4: 14-17 weeks
Month 5: 18-21 weeks
Month 6: 22-26 weeks
Third Trimester :
Month 7: 27-30 weeks
Month 8: 31-35 weeks
Month 9: 36-40 weeks