I had sex for the first time on November 19th and he didn’t cum nor was it full on sex it was about 3 strokes then we decided to stop

My period was late 7-8 days so I induced it with a lot of vitamin C

December 2nd was when it started I knew it was my period because it had blood clots in it since then my boobs have been tender, darker areolas ,backache , a bit of nausea,and I just feel like I am !

I took a pregnancy test 2 weeks ago (first response) and it was negative

Also the past 2 pregnancy tests were negative

What do y’all think ??