How do I determine my last menses & when I'm ovulating, if I didn't have regular menses for 3 years on Mirena? Had it removed 8/3/11, had light bleed only when wiping. Had coitus with husband 8/15/11 & bleeding increased with clots for a week then back to light bleed when wiping. Had coitus again with hubby 8/20/11 & no bleeding at all since. Could I be pregnant already or just wishful thinking, lol?