What Causes Lower Abdominal Pain And Frequent Urination Post Consumption Of Contraceptive Pills?

Need answers pls.. im 28 y/o, my partner and i have been trying to make me pregnant but it always turned out negative for almost 1 yr now. 2013 i take oral contraceptive for 14 months and i stop taking it on nov. 2014. for the next 5 months i have my regular period for 30-35 days cycle but for the next months my period became irregular. my next period came after 91 days, then after 74 days, then 54 days, then after 43 days. and now im 63 days late. i already take a hpt and the result is negative. whats happening to me? lately in experiencing a lower abdominal cramp specialy in the left side, a frequent urination ( almost every 15 -30 mins), and sometimes clear discharge. i gained weight and i always stay late at night. i sleep around 3 to 7 am for 3 months now.. thank you in advance for the help infos..