Found the following hamletworks.org entries referring to line 3670-1

View Commentary Note for 3669, etc.
3669-70 the fall of a Sparrowe, if it be <now>, tis not | to come, if it be not to come, 
3670-1 it will be now, if it | be not now, yet it {well} <will> come, the readines is all, 

View Immaterial Textual Note for 3669, etc.
3669-70 the fall of a Sparrowe, if it be <now>, tis not | to come, if it be not to come, 
3670-1 it will be now, if it | be not now, yet it {well} <will> come, the readines is all, 

View Material Textual Note for 3669, etc.
3669-70 the fall of a Sparrowe, if it be <now>, tis not | to come, if it be not to come, 
3670-1it will be now, if it | be not now, yet it {well} <will> come, the readines is all,