Preggy Confused

Gud pm... Very confuse na po kc ako... Im delayed for 5 days na, i took pt last sat... Nag 2 lines at ung isa super labo.. Then inulit ko at d result is negative.. Everyday akong nag test until today still negative... I had my contact last dec. 21 which is my expected ovulation period... Sobrang nppraning na ko.. I took also serum test still negative pden.. Gsto ko na sna mgpa other serum test which is beta hcg to confrm.. Kaso wala pa ko enaf budget cause its pricy... So tingin nyo ba preggy kaya ako??? Nagccramps ako at lower bachaches den... I had my MC last nov. Lang... Kaya worried ako maulit uli un.. :( sana my mkatulong .. TIA