My lmp was jan 29th but I had to take medroxyprogesterone to get that period. I have been ttc. Not really sure what exact day I ovulated so I was having sex alot ever since I had my last period. Well Wednesday March 9th I went to the Er and they did a blood pregnancy test that came up negitive. I was sure I wasn't pregnant but I also had very light pink spotting twice that same day and havent had nothing else. I was thinking that it could have been implantation bleeding. My question is even though the blood test was negitve could I still be pregnant? Could I have just gotten pregnant alot later than I thought? Would the hcg hormore been present if I had implantation bleeding the same day I got the blood test done? I also should mention that the reason I dont know when I ovulated is because I recently had my paraguard IUD taken out in December so I havent been having my period on my own. I took medroxyprogesterone to have a period. But I only took it in jan to try and get back to normal. I havent taken it recently. What do you think ?