I'm 20, Took Morning-After Pill, No Period for 1.5 Months, Negative Test: What Should I Do?

Ans: Sorry not able to understand. Can you please elaborate or be specific.

Ans: History noted,
Since 19th of last month was your last period and you had unprotected sex on 10th of this month, pregnancy test is negative,
It's advisable to wait for a week, repeat home pregnancy test or blood test call serum beta hcg which is confirmatory.
Sometimes it can be hormonal imbalance or delayed ovulation. So sometimes we need to wait for a week to know the test report.
If still pregnancy test is negative, then you can visit your doctor, to get pills for withdrawal bleeding and to get hormonal test and sonography done to find the cause of delayed periods.
POSTINOR is an "emergency contraceptive pill” or "morning after pill”, that contains one common female hormone, levonorgestrel, a progestin. This hormone prevents pregnancy mainly by delaying or preventing ovulation (the release of an egg from the ovary), thus preventing fertilization.
Postino can only prevent you becoming pregnant if you take it within 72 hours of unprotected sex. It does not work if you are already pregnant. If you have unprotected sex after taking Postino, it will not stop you from becoming pregnant.

Ans: Yes, taking the I-pill can cause delayed periods or irregular bleeding in the following 2 or 3 menstrual cycle. The I-pill is an emergency contraceptive pill that contains a high dose of hormones that can disrupt your menstrual cycle.
But it is advisable to do pregnancy test by serum beta hcg blood test or home pregnancy kit test to rule out pregnancy.
Since you are 44 years, there is possibility of hormonal imbalance.
It is advisable to visit your nearby gynae to rule out other causes if delayed menses by certain hormonal blood test or ultrasound .