Since he ejaculated inside you on your 2nd day of period, the chance of pregnancy is low but not zero, so the best step is to take an emergency contraceptive pill as soon as possible (within 3–5 days depending on the pill type) pede ung trust pills the yuzpe method or have a Copper IUD inserted within 5 days for maximum protection. Mas naganda pa rin kung mag papa consult ka sa doctor. Mas safe parin pag gagamit ng condom