I understand you're worried about the negative pregnancy test and your delayed period. This could be caused by various factors like stress, hormonal imbalances, or weight changes. Don't worry—this can sometimes be completely normal. Try to relax, eat healthily, and stay hydrated.

Since you took the morning after pill multiple times within a month may have altered your menstrual cycle and caused a delay in your period. But there is still a possibility of pregnancy even if you have taken the morning after pill. Because emergency contraception is not 100% effective in preventing pregnancy, and repeated use of the pill within a short period of time may decrease its effectiveness.

Having sex without protection on the second day of your period usually means there is a decreased chance of becoming pregnant. During this time, the egg is less likely to be ready for fertilization. However, it is not impossible to get pregnant so if you want to be extra safe, you might want to take emergency contraception within 72 hours just in case. 

It is quite normal to have a slip in the monthly cycle even if you didn’t get involved in any sexual activity. Stress, drastic weight changes, or changes in your daily schedule can affect your period. If the missed period is the only symptom you are experiencing, everything is probably okay. Your periods should return in a few weeks without any intervention. You need to take it easy and eat a balanced diet; also do some physical exercises and ensure to get enough sleep.