I'm 15 years old and I had my first sexual intercourse ...

I am 15 years old and had my first sexual intercourse in April of this year with the use of the condom. My menstruation was always regular, in a 28-day cycle, and after that, my cycle was changed to 35 days. I got scared, did a pharmacy test and got a negative result. The following month, once again the interval was 35 days, I re-did the test and got another negative. In month 7, my cycle returned to have 28 days, and in the month of August my cycle started to have 32 days. Am I at risk of being pregnant? I feel a little bit bloated, my breasts look bigger, can this all be psychological? I recently had a fainting spell at school, I do not know what caused it, could it be a sign of pregnancy? Please respond as soon as possible! Thank you, V. Soares.
Expert answer:

The main symptom for the doctor and the woman mistrust of pregnancy is the menstrual delay that did not occur in your case. You are menstruating, had intercourse with protection and pregnancy tests with negative result, this means that the chance of you being pregnant is very small.