7 Weeks, think I'm having a MC due to prior birth control please anything helps!

Hello, everyone I just have a few questions. So I'm Kaylah and I was currently 7 weeks pregnant but before I get into that I was previously on the nexplanon implant (in the arm) birth control, I had it removed in March 2015 because it made me bleed so much,  was on the pill for 2 weeks when my husband and I had decided we wanted to have a baby. AF came that very next week and then the following week we conceived. I am currently 7 weeks pregnant and I believe I am having a miscarriage. Yesterday morning I was spotting a little and it cleared up in the afternoon my husband and I had intercourse early that evening and then the bleeding seemed to be back and worse I thought maybe it was just from the second because I read online that that would be normal. And so I went to bed and this morning it was like worse but the bleeding was only when wiped after using the restroom so I called my nurse hotline and she said not worry it was just from the sex that if I pass any grey/white tissue to call back, well later this afternoon I passed the grey/white tissue and I believe that was my baby. It was about 3in long 1 to 2 inches wide and it looked just like the picture on my <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a>. Now the bleeding is getting worse and I'm wondering if this is because of the previous birth control? I've done some research online and there are other who worries match mine. Please if you relate to me in any way please let me know, it's being comfort to me to know that this could be the cause. Thank You and have a nice day!