am I pregnant

[princes1234]

I'm 35 my last period was 2-8-16 and always heavy I'm on elivial and trileptal I only had spotting no regular periods yet it's been 18 weeks I have unexplained weight gain milk in my breasts heartburn fatigue nausea irritation frequent urination not as bad lower back pain fluttering in my stomach that comes and goes I had a blood pregnancy test done 2 weeks and 2 days after the sex then another one 2 weeks later I heard that those 2 meds I listed can throw off the results for a false negative my stomach is hard at the top but not the bottom im overweight I believe I had a false negative results and just last week a negative urine test if im pregnant I'll be 18 weeks along how far along am I online pregnancy test says im pregnant help am I pregnant