Nursing a 1 year old somewhat exclusively; possibly pregnant again?

I have a year old and am feeding...I tried the bottle and even sippy cup but he refuses! I am trying to wean him off and it's frustrating cause all he cries and will not drink anything at all :( I must say he is a good feeder and does tend to drink water/juice from a real cup. I don't feed around the clock like I use to before he started eating solids (4 months old) he's a smart/big boy! He walked at 10 months...but anyway; his father and I have been having unprotected since my 6 week check up. I must say that aunt flo came briefly after that and has stopped since. My stomach is kind of showing and I tend to feel erflies in my lower stomach and somewhat faint kicks at night when I lay flat. I have took a home test and it was neg., but that was 4/5 months ago. I feel extremely exhausted and my body is screaming I'm pregnant and my man seems to think so also! I keep putting off my doc's app ts...I'm nervous but excited at the same time. Have any of you moms' became pregnant again while nursing? Thanks in advance for the answers!