Advice/support please

Me and my boyfriend are both teenagers. I am going into grade 11 and he is going into grade 12. We had unprotected sex 3 times. But this last time he thinks he came in me. Glow had said that was the day I was ovulating. Lately I've been having pains, nausea, tiredness, hunger, stronger smell, etc. Were going to go to the store together and get a couple pregnancy tests. Any advice would be greatly appreciated! ( which test, when to take it, how many, how to tell our parents, what to expect in the beginning of pregnancy and foods/drinks to stay away from?)