Hello, With above type of sexual activity, there is no chance of pregnancy. Actually pregnancy depends on proper timing of ovulation & unprotected sex with ejaculation. So you have nothing to worry. Continue prescribed medication to get regular period. Spotting may be due to hormonal imbalance. Avoid stress, take healthy diet with iron supplements, control body wt and maintain genital hygiene. Practice safe sex by using safe period/ Condom etc to avoid unwanted pregnancy. Be well & take care.