Mucus Like Brown Discharge And Tiredness With Period Like Cramps. Will Withdrawal During Sex Suffice Instead Of Contraception?

Hi, im 24 years old female sexually active with my partner 7 yrs i have not been on birth control over 2 and a half years i use withdrawl method as contraception (not ttc but would be happy if so). I have a regular 28/30 day cycle, back in august i did not get my period on due date there was a 50 day gap in btween July & august of course i thought i was pregnant!! But then my period showed 2 & a half weeks later started light really heavy & didn't last long as usual, i started to monitor my cycles closely since this happend. Sept period came on so that ment it was a 32 day cycle, oct again 32 day cycle nov again 32 day cycle, also i ovualted on 14/16 during these cycles, Now since nov ended 3 days later i started getting light brown discharge up until my ovulation then clear mucos with brown tinge to it this lasted 3days then following that the brown "spotting" is getting heavier & darker this is day 23 of my cycle.. I was intimate on days 7-8-12 of nov cycle. I know what's going on but it has me very worried i am more tired over d past week mood swings an have slight cramping like my period is going to come but im not due 4 atleast another 8 days.. Any info please thanks you