I had a emergency medical evac on the 14th of Dec 2011...Doctor said that, I'm perfectly healthy it was just my baby stopped growing due to natural causes. I then started my period on the 14th of January 31 days after the Evac...my normal cycle use to be 28 days. Now I don't know when I ovulate or when I should start my period...I have a very weird lower back pain since yesterday, I've not been sleeping well not cause of the pain but cause I just don't feel tired...I usually sleep very well. I tested yesterday and this morning...all negative but now I don't know when should I start my period??? Cause my cycle is not totally as it always was...I just need some advice cause I don't know anymore...my husband and I have a very healthy sex life...we have sex every couple of days...so there's no need to take tempratures or all that....How will I know if I'm pregnant?