Advice.. FTM

Hello just wandering if anyone can help.. I’m a ftm so unsure on what’s going on!( I’ll be 25 weeks on Sunday) I had a nap 40 minutes ago for an hour, and since waking up I’ve had weird feelings in my belly, sort of like the baby moving but also like I’ve got a really dodgy belly.. tmi (I went to the toilet to see if a poo would help and it hasn’t) and I have terrible Nausea, I got in the bath to see if that would help and I feel exactly the same, also feels like I have period like cramps which go down to my left knee. I’m sat on our sofa now and I can feel the baby moving like crazy which is making my belly ache feel worse.. Is this all normal? Also like to say my bump feels bruised if that makes sense, It feels tender.. would having heartburn give me these symptoms? Or gastritis? I got diagnosed with gastritis about 7/8 months ago so take ranitidine twice a day! Sorry for the long post