Garbhavastha Ka prarambhik

Garbhavastha ka prarambhik dour ek mahavari ke pura hone se dusri mahavari ke shuru hone ke bich ka hot ahai. Yani pehli mahavari ke antim din se dusri mahavari tak garbhadharan huye 28 din maan liye jate hai. Halaki yeh tay nahi hai, lekin aamtour par garbhdharan ki prakriya mai yahi formula apnaya jata hai.