Having a ton of pregnancy symptoms but haven't tested yet

I am experiencing a ton of pregnancy symptoms but haven't yet taken a home pregnancy test out of fear of it saying negative. I have been TTC (3rd child) for a year with no luck and have spent a lot of money on pregnancy tests only to find out each time that I am NOT pregnant. =( I was supposed to start my period on March 6th (yersterday) but I have been known to be late every other month or so. (Last period was Feb 6th) Here are the symptoms I have been having:
- Tender breasts, especially on the sides. Not swollen and nipples are not darker or anything
- Lower back pain
- VERY tired..going to bed earlier and feeling really sleepy at work during the day
- Acne on face, neck and chest
- Slight cramping in abdomen

Can anyone please tell me if this sounds promising or not. Every month I get so excited because I think I might be pregnant so I go out and buy a few tests and they all come out negative. Should I wait longer or do these symptoms say I am probably pregnant? I don't want to get my hopes up like they have been for the past 12 months. Any advice or similar stories would help. Thanks so much!! =)