Anxious

So I was suppose to get my period the 8th it is now the 20th. I also had sex on ovulation day of last month. I am having some pregnancy symptoms like back ache and being nauseated. I wake up and my stomach is sore like I've been laying on it and I know I haven't also my ribs are sore and I've been incredibly hormonal lately. I took a test the 17 th it wasn't morning urine and I got not pregnant. I've miscarried 3 and I'm trying not to get my hopes up. When I was pregnant with my daughter I couldn't get a positive until I was 7 weeks. When should I take another test?