Chemical pregnancy? Help?

10/5 first day of last period
11/1 positive pregnancy tests (3 tests)
11/3 last time I had intercourse, I think it hit my cervix (it hurt)
11/4 started spotting brown
11/5 woke up to a lot of red blood & severe cramps (lasted throughout the day) took a test later in the day (still +)
11/6 woke up to morning sickness, mild cramps, & more red blood
Could this be a chemical pregnancy? Why did I have morning sickness? Could intercourse have anything to do with this? False positive? I'm 18, this is my first pregnancy, I'm really concerned, please help.