well .. if you are a reasonable person you ll find that the answer is yes. because no one knows what happens if you get pregnant.. he may leave you so you get stuck with the baby. you will ruin your youth plus you will feel guilty in front of your parents
In today's society, things are different than before, so I think it's ok. However I don't believe in being with a different man or woman every night. If you're going to "do it" before marriage, you should be very committed to them and because you love each other deeply. Doing it a couple months after starting a relationship, no that is not okay.
Just know what the end product of "it" is....and ask if you are ready for one or two? The only 100% protection is to not do "it". One of my wifes bff's got stuck with twins...because her bf bailed when he found out she was pregnant.