What are my chances here ladies??

So ladies long story short:

- ttc for 5 months

- last period was july 4th-10th

- took a vacation with family july 6-24th

- hubby and i had unprotected sex july 24th and everyday after for 2 weeks

-spotted 2 weeks ago for 2 days a couple wipes each day

- period 13 days late

- took a test this past thurday and came out negative

Symtoms:

- very mild cramps just started a week past period date and last a couple minutes and are rare

- tired all day and headaches

-nausea spells

- bad lower back pain can barely bend over too far

-extra moody and cry over alot of small stupid things.

What do you think ladies? Is it possible im still pregnant? Should i test again and when?