[Cupcakemomma]

I am 22 years old and I have a 3 year old daughter. My boyfriend is stationed in Fort hood Texas and while he was home on leave for 3 weeks we had a lot of unprotected sex. Right before he left I got my period but it wasn't normal. It was more spotting than a full normal cycle. It stopped than I had a little more spotting.
Here are my symptoms a few weeks later,

I'm nauseous throughout the day on and off
Abdominal cramps
Frequent trips to the bathroom
Headaches
Some muscle/body aches
Heartburn when I lie down for bed. Sometimes bad
And my boobs hurt so bad!

Sounds like possible pregnancy or just a virus? I've taken 2 pregnancy tests and both were negative but the above symptoms wont subside. I never had any morning sickness with my 1st pregnancy so all these symptoms are new to me. Please share your thoughts