worried to have a period after tamox and zoladex..plz help

pls sisters ..

am really confused now,,need u to tell me wat happenned with u ....

i was 34 wen diagnosed with BC last august..now 35..

i never lost my period during 6 chemo FEC ,

after the chemo finished in 25 jan.my period dissappeared for 3 months(january,february,march)

then the periods came bak in 16 april for the 1st period after chemo and rads and in may for the 2nd period after chemo and rads..

i started my tamox in 13 may and had my 1st zoladex injection in 18 may and i thought i will not have any periods after the injection and the tamoxifen..but i had my period for this month today|!!!!!!!!!!

is that normal?or it means that the tamox and the zoladex didnt work??????????

am really worried