Pregnancy at 17? My period is late and I am not able to buy pregnancy test

I am on the RIGEVIDON contraceptive pill and have been for almost a year now. I often follow the instructions (there have been a few times where I have forgotten to take the pill however not whilst being sexually active)

I am 18 this month and my boyfriend is 19. We often use a condom, pull-out method along with the pill, however there have been times when we have had sex without using a condom (I have always made sure that he has pulled out). I can't remember the exact day we had sex but we engage in intercourse at least twice a week, and so it could have been any of these times that have caused possibly pregnancy.

I am aware that leakage of sperm can cause pregnancy and recently I have been having some interesting symptoms: I strongly felt like I was going to throw up on two separate occasions, once last week and once this week, however once I had rushed to the bathroom, I burped and the sickness was gone. I'm not sure if this still counts as morning sickness. Also, I noticed last week that my appetite had changed- I felt fuller sooner than usual. However my eating habits are back to normal this week.

I thought that since these symptoms only happened last week, that it might have been just a bug or something, however this morning I found I had leaked a very small amount of blood with my discharge- it was very light- only slightly light pink. I then began researching pregnancy symptoms and found that spotting, nausea and change in appetite are all possible symptoms. I also found that feeling more emotional is also a symptom, and I have realised I have been feeling very weepy last week.

My period doesn't start until a week in 2 days, and the wait is killing me. I am not able to buy a pregnancy test until Friday as neither I nor my boyfriend have been paid yet and we have both recently spent all our money. My parents do not know that I am sexually active and this has caused me to stress even more. I am worried that my anticipation for my period to come will cause it to delay, even if I am not pregnant.

My question is if my symptoms show strong possibility that I might be pregnant, and if I should take a test earlier than Friday. I don't feel that I am pregnant however I am not aware of any other explanation for my symptoms.

Also, advice on how to confess to my parents that I will require an abortion would also be appreciated.

PS: I am aware that I should have been more responsible for my actions and fully regret not using a condom during sex and for relying only on the contraceptive pill, however I am not looking for lectures (I don't mean to sound rude in saying that)

Thank you for any help!!