Getting one's makeup done before the wedding

Q: What is the ruling for a woman who is forced to do makeup at  a beauty parlor on her wedding day? The halal status of the makeup used at the beauty parlor is not known and the esha prayers will have to be offered with that makeup since people at the parlor do the makeup quite early. Should a woman accept the request of her in-laws to go to the beauty parlor for her makeup or should she argue against it?

Spotting before the 15th day of tuhr

Q: For many months I have been spotting every month before 15 days finished. As such I was counting the beginning of my haidh from 15 days. But the spotting continued for the first few days sometimes upto 4/6 days into my haidh. Then only would the bleeding properly start but would thereafter finish after 10 days. So the few days I ws bleeding after 10 days I was counting as it as istihaadha. This continued for about 6 months.

Then I had 2 regular haidh cycles (without spotting in between and remaining within 10 days). Then the problem began again for the last 3-4 months. This current haidh I have been spotting since the 8th day of tuhr. After 15 days the spotting, I kept starting and stopping in bigger patches but the flow did not start. On the 10th day the blood flow began properly and I started having a normal haidh period. I had ghusl on the same day and began salaah even though I am still bleeding heavily.

Questions: How should I calculate my haidh? Which days will be haidh and which will be istihaadhah?

If a similar thing happens again or happens often how should I calculateit ?

Is there any amal I can do that can help regulate my haidh?

Doubting if one gargled during ghusal

Q: Girl has been baaligh for about 5 years. She remembers being particular about doing ghusls from her menstruation but now shes getting doubts that sometimes she might have got yellow discharge in her menstruation days in the first few years and she didnt do ghusl again because she used to get yellow discharge in her paaki days (as white discharge when drying up can turn yellow) but now shes getting doubts and she used to have a bath eveyday (like washing her whole body) but cant remember if every time if she washed her nose and gargled so now how much qadha namaz should she pray coz her ghusl might be done at the wrong time.

Taking a loan from someone who took a loan on interest

Q:

1. If I borrow a certain amount of money from a person with the intention of paying back the exact amount to my lender but the money that has been lended to me is money that has been borrowed by my lender that has agreed to pay back with riba to his lender. Can I use the money knowing this?

2. If I lend a person money but the person pays back my money from borrowing from another person with riba? Can I accept?

3. If a person gives me a gift but I doubt if the gift is bought from haraam money. Can I take it?

4. I lend someone $180 but they pay back me $200 without me asking can I keep?