chest infection when pregnant that won't go away with antibiotics

Nic
Hi I'm 12 weeks pregnant today and I went to the doctor last week and found out I had a chest infection, which the Dr gave me amoxicillin capsules to take for a week. I'm on my last lot of tablets today and the antibiotic has not worked! If anything I feel like I've got worse! I'm constantly coughing and my tummy/back muscles and so sore and also my chest! When I breathe I can hear it rattling in my chest and I'm very breathless! I've not had a proper sleep in over a week as that's when it's at it's worst and also have to sleep sitting up! I'm going to call the dr again tomorrow! I'm just wondering is it safe for me to get another lot of antibiotics or anyone else been in a similar situation and know when it will finally go away?! I'm also worried about the baby with all this coughing and I don't have my scan till Wednesday! Any advice would be much appreciated! Thank you!