MISHNA BERURAH YOMI MISHNA BERURAH DIRSHU JUNE 13

S"A 209 Mishna Berurah sif katan 9
see Mishna Berurah above 167 sif katan 9(if your uncertain if you made the bracha or not dont make it again b/c we are makal reason is b/c we are worried about a bracha livatala)
Mishna Berurah Dirshu chelek 2
Q:Is their a way to make the bracha again

A:Yes RA"E brings the Rambam thats says you can think the bracha and your yotzei the Chazonish also says this(for more see Mishna Berurah Dirshu chelek 2 footnote 9)