I had unprotected sex in march, took the plan b pill the next morning and had a normal period in April. I've taken a few different pregnancy tests all coming back negative but I'm having weird feelings in my stomach. Is there any way I could still be pregnant?

It would be very unlikely since you used the plan b right afterwards and had a normal period. It would be too early in a pregnancy to feel any movement if that is what you think might be going on.
See what happens when your period is due for May. You could always test again in a couple of weeks for the peace of mind.