Your irregular period makes it difficult for you to get pregnant, however it is not impossible. Pink stains might just as well be an irritation, tell your partner about it. It could just be the technique.
Sore breast may be due to hormonal
stimulation and has nothing to do with the bloody discharge after sex.
Consult an obstetrician to manga your irregular cycle and thats the time you might get pregnant already, unless your partner is the one having problem with fertility
. Encourage him to consult also for complete evaluation and increase the likelihood of you getting pregnant.
Thank you, pls update as to the result of your consultation.