Four people staying in a room which was booked for two people

Q: I stayed with friends at a rented accomodation where in the agreement, only 2 people are allowed to stay each night for around 100$ per night. However, we lied to the owner and agreed that only 2 people will stay while actually 4 people stayed. We didnt think this was wrong since we would only use the accomodation for sleeping and wanted to save money. So technically we broke the agreement and cheated the owner.

What is the best way to fix this as we are afraid that in the akhirah, we will be punished, since we used his property not according to the agreement. If we reach out to him, he may take action against us so we are afraid. Could we pay him the money for the 2 extra people (we assume it will be 50$ per night per person) and give it to him anonymously? Or can we just donate this amount to chairty because we are afraid to tell him.

Receiving cash back or discounts when purchasing with a credit card

Q:

1. When purchasing goods via a credit card, I received 1 rupee on every purchase of 200 rupees. Is this permissible or not?

2. Different offers are available on credit card and easy paisa accounts everyday. If we purchase and make some payments and order some food via the credit card and easy paisa account, then we will receive a special discount or cash back. Is this permissible or not?

If this is "sood" then what is best use of this amount.

Calculating haidh while doing IVF treatment

Q: In regards to my menses, I have a 28 day cycle... give or take. If I wipe and find a little change of colour on the toilet paper, I know I'll get my menses a couple of days later. Unfortunately, at the moment I've been having IVF treatments and I just stopped taking hormone replacement tablets and on to taking my injections, however, the nurse told me that my hormone medication and injections will overlap for 3 days and then I'll get my menses.

Now, this is the part I get confused because, the day she said that, which was a Wednesday, I had a few days before I thought I'd get my period, but on that day she said that, I saw a slight colour change on the toilet paper, anyway I still kept on praying because the day she said I get them was not the day I saw it, as I had a couple of more days before and I'm glad I did continue praying, because every other time I wiped it was clear and this happened to me for a couple of days, but yesterday, there were spots of blood on my underwear so, I washed and still prayed Dhur, but I again saw spots on my fresh underwear after changing them and now it was closer to the time when she said I was suppose to get them so, I didn't pray my maghrib, Isha or today's Fajr and now it's clear again and I've missed 3 salats and I'm upset!

What do I do in this situation and how can I make up these salats?

P.S. I feel if I do pray at the moment, I feel like I'm doing the wrong thing and if I don't pray at the moment, I feel like I'm still doing the wrong thing.