Weight gaining. During coitus? saliva?

Hi Dr 4 mnths ago I used oral pills instead of condoms..is it leads to weight gain ? Breast also enlarged ..puffy face..no other external changes appeared.. ND I'm vry healthy person ND regular menses ..bt after using pills..2 mnths delayed menses after that menses occurs ...bt at that tym i suffer wid abdominal pain..backache..bearing down pains of lower limbs ..fatigue ..irregular headache..ND I thought I'm risky bcz 4 mnths ago I'm exposed to sex wid 2 partners no protection .i used .only pills ..so this leads to any prblm to me in future like UTI , STD, any other diseases ..? Nd i move on wid healthy person one of them ..ND the other one is already sexually acted wid other girls before met me.. I'm not confirm is he is healthy or not or he is suffering wid any genital diseases previously ...bt he is addicted to alcohols ,smoking ..I afraid that now any risk causes from his semen during coitus ? Saliva? Or in any way ..plz suggest me