As the title says.. we had a bit of a malfunction in the contraceptive department. It also happened to be on my predicted ovulation date as well. I started having really bad lower back ache 4 days after and very sore nips. I am so tired the last few days I have to nap when my babies are napping. I have a 3 year old and an 11 month old. As much as having another baby would be a blessing and I would be so thankful...I a just not ready mentally for another one. I would have three children three and under.. My, My. So as for the question I have, with my pregnancy I got lower back pain a few days after O day as well but could this just be PMS? How soon do you all have your PMS after O day?