Ms. Akshi
First of all everyone should know that there is a difference in a sign or rasi and a house or bhava. Ketu is in sign Taurus but in 6th house. So Ketu has to give 6th house (detriment to marriage). Whenever Ketu period runs then only 6th house matters move. 6th house deals success in your undertakings, win over opponents , gains in a job etc. These things happen in Ketu periods. So not at all to worry.
Marriage has not taken place in Rahu period.Why? Rahu is signifying 3rd (negotiations), 4th (status quo) through Saturn and 6th (detrimental to marriage) through Jupiter. So marriage has not taken place.
Marriage is promised or not? 7th cusp sub lord Venus, who is the kalatra karaka is in 7th house. So you will definitely have the marriage in your life. It would be in Jupiter dasa Saturn bhukti which is upto 23-12-2028. In that next year is possible for marriage.
Good Luck
JVS Rao (KP system follower)