Unexpected bfp

Unexpectedly tested positive today. I had my mirena removed back at end of April. It caused me a lot of problems, and moved out of place. I had it for 3 years after the birth of my son. I had period around May 31. I been working out and loosing weight, finally got to my normal weight. So I was hesitant on taking my bc pills just yet. One unprotected sex, I test around July 5-7 since I would of gotten my period and was late and it was negative. I also used first response. Today I used dollar tree, because I was like whatever there no way I'm pregnant. I have zero symptoms, where to as my past 5 kids I always knew. Got bfp. Didn't even tell my husband yet. I have 17,16,11,8 and 3 year olds boy girl pattern. My 8 year old daughter was conceived with the help of this group! I'm going to be 38 and my husband is 49. It's going to be a super busy year with my son graduating and getting ready to play football in college.