What is going on?? Please help 😬

Let me just start of with that I do take birth control pills but this has never happened.

I noticed on January 16th 2020 that I was having some spotting (brown/old blood). I didn’t think much of it and continued on with my day. That following, on the 17th I was still having spotting but taking my birth control on time still till the end of my pack. On the 18th I’m STILL spotting. On the 19th I wasn’t spotting (to my acknowledge) so I had decided to have sex with my boyfriend that night and we used a toy. After we finished having sex, we both noticed a lot brown blood on myself and his pelvis area, and cleaned up as usual after. On January 20th I start (you guessed it 😪) spotting again, later on that day/night I went to the bathroom and when I wiped, there was a toonie size of very bright blood, so just to be on the safe side I took a pregnancy test and it came back negative. On the 21st I took my last birth control pill from my pack but still again spotting brown/old blood. On the 22 and the 23 I was still spotting. On the 24th, I was expecting my period to start that day but nothing still brown blood, so went out and got a another pregnancy test and that came back negative too. Today I’m FINALLY having normal period blood😪😪😪😪

My main question is, why was I spotting for 9 days straight? I took the pregnancy tests because my boyfriend my doesn’t pull out when we have sex nor do I let him 😅 but because I felt like I was having pregnancy symptoms (lower back pain, nausea, moody, tired than normal, headaches, sensitive breasts)

A friends mom thinks I might have a bad infection maybe and to call my doctor to get a Pap smear done.

Any help/advice would be greatly helpful!!!!!