simply wait for a wk . Most probably u wont b
pregnant.abnormal periods can be because of stess/change of place/hormonal change ...like
thyroid or
prolactin disorder/endometritis/ pcod.
If anxious thn u can visit good gynecologist or directly online for further investigations n usg to find out the cause n for management. Also better to indulge in safe sex. Use condom for protection against
STD/PID. N get vaccimated against HPV for primary prevention of cancer cervix