TTC... going on month 4

Kat • Stay at home mommy and wife
So here is my problem. My period has never been regular and I conceived my son when I should have started my period back in May 2013 while one birth control while visit family in Maui. (Gotta love Hawaii) Now here we are actually wanting to get pregnant an the <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation apps</a> both say different things. One says I should ovulate this week an the other says I should start next week. I'm setting here feeling bloated and cramping. I even been supper exhausted even after a full nights rest. I took a test an it was negative. I'm never sure when I'll start but I know my cycle can go over the average 28-29 days.